diff --git a/app/src/main/java/com/github/nullptroma/wallenc/app/auth/YandexSignInService.kt b/app/src/main/java/com/github/nullptroma/wallenc/app/auth/YandexSignInService.kt
index 78920ff..191471d 100644
--- a/app/src/main/java/com/github/nullptroma/wallenc/app/auth/YandexSignInService.kt
+++ b/app/src/main/java/com/github/nullptroma/wallenc/app/auth/YandexSignInService.kt
@@ -6,6 +6,7 @@ import androidx.activity.result.ActivityResultLauncher
 import com.github.nullptroma.wallenc.domain.vault.vaults.yandex.YandexRegistration
 import com.github.nullptroma.wallenc.vault.contract.CloudBrand
 import com.github.nullptroma.wallenc.vault.contract.RemoteVaultAuthenticator
+import com.github.nullptroma.wallenc.vault.contract.VaultLinkFailure
 import com.github.nullptroma.wallenc.vault.contract.VaultLinkOutcome
 import com.yandex.authsdk.YandexAuthLoginOptions
 import com.yandex.authsdk.YandexAuthOptions
@@ -70,16 +71,12 @@ class YandexSignInService @Inject constructor(
 
     override fun beginLink(brand: CloudBrand, onResult: (VaultLinkOutcome) -> Unit) {
         if (brand != CloudBrand.YANDEX) {
-            onResult(VaultLinkOutcome.Failed("Brand $brand is not supported by YandexSignInService"))
+            onResult(VaultLinkOutcome.Failed(VaultLinkFailure.UnsupportedBrand))
             return
         }
         val l = launcher
         if (l == null) {
-            onResult(
-                VaultLinkOutcome.Failed(
-                    "YandexSignInService: call registerWith(activity) from MainActivity.onCreate first",
-                ),
-            )
+            onResult(VaultLinkOutcome.Failed(VaultLinkFailure.NotRegistered))
             return
         }
         synchronized(this) { pending = onResult }
@@ -90,9 +87,7 @@ class YandexSignInService @Inject constructor(
         is YandexAuthResult.Success ->
             VaultLinkOutcome.Success(YandexRegistration(result.token.value))
         is YandexAuthResult.Failure ->
-            VaultLinkOutcome.Failed(
-                result.exception.message ?: result.exception.toString(),
-            )
+            VaultLinkOutcome.Failed(VaultLinkFailure.AuthError)
         YandexAuthResult.Cancelled -> VaultLinkOutcome.Cancelled
     }
 }
diff --git a/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/errors/VaultThrowableMapping.kt b/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/errors/VaultThrowableMapping.kt
new file mode 100644
index 0000000..ab7ca0c
--- /dev/null
+++ b/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/errors/VaultThrowableMapping.kt
@@ -0,0 +1,54 @@
+package com.github.nullptroma.wallenc.domain.vault.errors
+
+import com.github.nullptroma.wallenc.domain.errors.WallencException
+import com.github.nullptroma.wallenc.domain.errors.toWallencException
+import com.github.nullptroma.wallenc.domain.vault.network.yandexdisk.YandexDiskAuthException
+import retrofit2.HttpException
+import java.io.FileNotFoundException
+import java.io.IOException
+
+fun Throwable.toVaultWallencException(): WallencException = when (this) {
+    is WallencException -> this
+    is YandexDiskAuthException -> WallencException.Auth.Failed
+    is HttpException -> WallencException.Network.HttpFailed(
+        operation = "http",
+        statusCode = code(),
+        cause = this,
+    )
+    is FileNotFoundException -> WallencException.Storage.FileNotFound
+    is IOException -> mapVaultIo(this)
+    is IllegalStateException -> mapIllegalState(this)
+    is IllegalArgumentException -> mapIllegalArgument(this)
+    else -> toWallencException()
+}
+
+private fun mapVaultIo(e: IOException): WallencException {
+    val msg = e.message.orEmpty()
+    return when {
+        msg.contains("OAuth token is missing", ignoreCase = true) ->
+            WallencException.Auth.TokenMissing
+        msg.contains("HTTP 423", ignoreCase = true) || msg.contains("423 after retries", ignoreCase = true) ->
+            WallencException.Network.ResourceLocked
+        msg.contains("async operation timed out", ignoreCase = true) ->
+            WallencException.Network.OperationTimedOut
+        msg.contains("async operation failed", ignoreCase = true) ->
+            WallencException.Network.OperationFailed
+        else -> WallencException.Network.IoFailed(e)
+    }
+}
+
+private fun mapIllegalState(e: IllegalStateException): WallencException = when {
+    e.message == "Not a file" -> WallencException.Storage.NotAFile
+    e.message == "Not a directory" -> WallencException.Storage.NotADirectory
+    e.message?.startsWith("Path segment is a file:") == true -> WallencException.Storage.PathIsFile
+    e.message?.startsWith("Cannot openWrite over directory:") == true ->
+        WallencException.Storage.CannotWriteOverDirectory
+    e.message?.startsWith("Expected file after upload:") == true ->
+        WallencException.Storage.UnexpectedState
+    else -> WallencException.Storage.UnexpectedState
+}
+
+private fun mapIllegalArgument(e: IllegalArgumentException): WallencException = when {
+    e.message == "Deleting root path is forbidden" -> WallencException.Storage.DeleteRootForbidden
+    else -> WallencException.Unknown(e)
+}
diff --git a/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/UnlockManager.kt b/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/UnlockManager.kt
index 3a83419..452f146 100644
--- a/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/UnlockManager.kt
+++ b/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/UnlockManager.kt
@@ -1,5 +1,6 @@
 package com.github.nullptroma.wallenc.domain.vault.storages
 
+import com.github.nullptroma.wallenc.domain.errors.WallencException
 import com.github.nullptroma.wallenc.domain.vault.model.StorageKeyMap
 import com.github.nullptroma.wallenc.domain.vault.ports.StorageKeyMapStore
 import com.github.nullptroma.wallenc.domain.vault.storages.encrypt.EncryptedStorage
@@ -109,9 +110,9 @@ class UnlockManager(
         rememberPassword: Boolean
     ): EncryptedStorage = withContext(ioDispatcher) {
         return@withContext mutex.withLock {
-            val encInfo = storage.metaInfo.value.encInfo ?: throw Exception("EncInfo is null") // TODO
+            val encInfo = storage.metaInfo.value.encInfo ?: throw WallencException.Storage.EncInfoMissing
             if (!Encryptor.checkKey(key, encInfo))
-                throw Exception("Incorrect Key")
+                throw WallencException.Storage.IncorrectKey
 
             val opened = _openedStorages.value.toMutableMap()
             val cur = opened[storage.uuid]
diff --git a/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/encrypt/EncryptedStorage.kt b/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/encrypt/EncryptedStorage.kt
index af86156..1912174 100644
--- a/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/encrypt/EncryptedStorage.kt
+++ b/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/encrypt/EncryptedStorage.kt
@@ -1,5 +1,7 @@
 package com.github.nullptroma.wallenc.domain.vault.storages.encrypt
 
+import com.github.nullptroma.wallenc.domain.errors.WallencException
+
 import com.github.nullptroma.wallenc.domain.vault.storages.common.BaseStorage
 import com.github.nullptroma.wallenc.domain.datatypes.EncryptKey
 import com.github.nullptroma.wallenc.domain.encrypt.Encryptor
@@ -27,7 +29,7 @@ class EncryptedStorage private constructor(
     private val scope = CoroutineScope(ioDispatcher + job)
 
     private val encInfo =
-        source.metaInfo.value.encInfo ?: throw Exception("Storage is not encrypted") // TODO
+        source.metaInfo.value.encInfo ?: throw WallencException.Storage.NotEncrypted
 
     override val isVirtualStorage: Boolean = true
 
@@ -50,7 +52,7 @@ class EncryptedStorage private constructor(
 
     private fun checkKey() {
         if (!Encryptor.checkKey(key, encInfo))
-            throw Exception("Incorrect key") // TODO
+            throw WallencException.Storage.IncorrectKey
     }
 
     fun getKey(): EncryptKey = EncryptKey(key.bytes)
diff --git a/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/local/LocalStorageAccessor.kt b/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/local/LocalStorageAccessor.kt
index bb63146..a5f7b6b 100644
--- a/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/local/LocalStorageAccessor.kt
+++ b/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/local/LocalStorageAccessor.kt
@@ -1,5 +1,7 @@
 package com.github.nullptroma.wallenc.domain.vault.storages.local
 
+import com.github.nullptroma.wallenc.domain.errors.WallencException
+
 import com.fasterxml.jackson.core.JacksonException
 import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
 import com.fasterxml.jackson.module.kotlin.readValue
@@ -230,7 +232,7 @@ class LocalStorageAccessor(
         dirCallback: (suspend (File, CommonDirectory) -> Unit)? = null
     ) {
         if (!checkAvailable())
-            throw Exception("Not available")
+            throw WallencException.Storage.NotAvailable
         val basePath = Path(_filesystemBasePath.pathString, baseStoragePath)
         val workedFiles = mutableSetOf<String>()
         val workedMetaFiles = mutableSetOf<String>()
@@ -396,7 +398,7 @@ class LocalStorageAccessor(
 
     override suspend fun getFileInfo(path: String): IFile {
         val pair = LocalStorageFilePair.from(_filesystemBasePath, path)
-            ?: throw Exception("Что то пошло не так") // TODO
+            ?: throw WallencException.Storage.UnexpectedState
         return CommonFile(
             metaInfo = pair.meta,
         )
@@ -404,7 +406,7 @@ class LocalStorageAccessor(
 
     override suspend fun getDirInfo(path: String): IDirectory {
         val pair = LocalStorageFilePair.from(_filesystemBasePath, path)
-            ?: throw Exception("Что то пошло не так") // TODO
+            ?: throw WallencException.Storage.UnexpectedState
         return CommonDirectory(
             metaInfo = pair.meta,
             elementsCount = null
@@ -413,7 +415,7 @@ class LocalStorageAccessor(
 
     override suspend fun setHidden(path: String, hidden: Boolean) {
         val pair = LocalStorageFilePair.from(_filesystemBasePath, path)
-            ?: throw Exception("Что то пошло не так") // TODO
+            ?: throw WallencException.Storage.UnexpectedState
         if (pair.meta.isHidden == hidden)
             return
         val newMeta = pair.meta.copy(isHidden = hidden)
@@ -440,7 +442,7 @@ class LocalStorageAccessor(
         val path = Path(_filesystemBasePath.pathString, storagePath)
         val file = path.toFile()
         if (file.exists() && file.isDirectory)  {
-            throw Exception("Что то пошло не так") // TODO
+            throw WallencException.Storage.UnexpectedState
         } else if(!file.exists()) {
             val parent = Path(storagePath).parent
             createDir(parent.pathString)
@@ -451,7 +453,7 @@ class LocalStorageAccessor(
         }
 
         val pair = LocalStorageFilePair.from(_filesystemBasePath, file)
-            ?: throw Exception("Что то пошло не так") // TODO
+            ?: throw WallencException.Storage.UnexpectedState
         val newMeta = pair.meta.copy(lastModified = Clock.systemUTC().instant(), size = Files.size(pair.file.toPath()))
         writeMeta(pair.metaFile, newMeta)
         _filesUpdates.emit(
@@ -468,13 +470,13 @@ class LocalStorageAccessor(
         val path = Path(_filesystemBasePath.pathString, storagePath)
         val file = path.toFile()
         if (file.exists() && !file.isDirectory) {
-            throw Exception("Что то пошло не так") // TODO
+            throw WallencException.Storage.UnexpectedState
         } else if(!file.exists()) {
             Files.createDirectories(path)
         }
 
         val pair = LocalStorageFilePair.from(_filesystemBasePath, file)
-            ?: throw Exception("Что то пошло не так") // TODO
+            ?: throw WallencException.Storage.UnexpectedState
         val newMeta = pair.meta.copy(lastModified = Clock.systemUTC().instant())
         writeMeta(pair.metaFile, newMeta)
         _dirsUpdates.emit(
@@ -512,7 +514,7 @@ class LocalStorageAccessor(
 
     override suspend fun delete(path: String) = withContext(ioDispatcher) {
         if (path == "/" || path.isBlank()) {
-            throw IllegalArgumentException("Deleting root path is forbidden")
+            throw WallencException.Storage.DeleteRootForbidden
         }
         val pair = LocalStorageFilePair.from(_filesystemBasePath, path)
         if (pair != null) {
@@ -527,7 +529,7 @@ class LocalStorageAccessor(
     override suspend fun openWrite(path: String): OutputStream = withContext(ioDispatcher) {
         touchFileInternal(path, recordJournal = false)
         val pair = LocalStorageFilePair.from(_filesystemBasePath, path)
-            ?: throw Exception("Файла нет") // TODO
+            ?: throw WallencException.Storage.FileNotFound
         return@withContext pair.file.outputStream().onClosed {
             CoroutineScope(ioDispatcher).launch {
                 touchFileInternal(path, recordJournal = false)
@@ -539,13 +541,13 @@ class LocalStorageAccessor(
 
     override suspend fun openRead(path: String): InputStream = withContext(ioDispatcher) {
         val pair = LocalStorageFilePair.from(_filesystemBasePath, path)
-            ?: throw Exception("Файла нет") // TODO
+            ?: throw WallencException.Storage.FileNotFound
         return@withContext pair.file.inputStream()
     }
 
     override suspend fun moveToTrash(path: String) = withContext(ioDispatcher) {
         val pair = LocalStorageFilePair.from(_filesystemBasePath, path)
-            ?: throw Exception("Файла нет") // TODO
+            ?: throw WallencException.Storage.FileNotFound
         val newMeta = pair.meta.copy(isDeleted = true)
         writeMeta(pair.metaFile, newMeta)
         appendSyncEntry(path = path, operation = StorageSyncOperation.DELETE)
diff --git a/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/yandex/YandexStorageAccessor.kt b/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/yandex/YandexStorageAccessor.kt
index ce9a0b5..d939fdc 100644
--- a/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/yandex/YandexStorageAccessor.kt
+++ b/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/storages/yandex/YandexStorageAccessor.kt
@@ -1,5 +1,8 @@
 package com.github.nullptroma.wallenc.domain.vault.storages.yandex
 
+import com.github.nullptroma.wallenc.domain.errors.WallencException
+import com.github.nullptroma.wallenc.domain.vault.errors.toVaultWallencException
+
 import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
 import com.github.nullptroma.wallenc.domain.vault.network.yandexdisk.YandexDiskAuthException
 import com.github.nullptroma.wallenc.domain.vault.network.yandexdisk.dto.ResourceDto
@@ -104,19 +107,23 @@ class YandexStorageAccessor(
         } catch (e: YandexDiskAuthException) {
             reportAuthFailure()
             _storageReady.value = false
-            throw e
+            throw WallencException.Auth.Failed
         } catch (e: Exception) {
             _storageReady.value = false
-            throw Exception("Yandex storage init failed", e)
+            throw e.toVaultWallencException()
         }
     }
 
     private inline fun <T> guard(block: () -> T): T {
         try {
             return block()
+        } catch (e: CancellationException) {
+            throw e
         } catch (e: YandexDiskAuthException) {
             reportAuthFailure()
-            throw e
+            throw WallencException.Auth.Failed
+        } catch (e: Throwable) {
+            throw e.toVaultWallencException()
         }
     }
 
@@ -445,13 +452,13 @@ class YandexStorageAccessor(
 
     override suspend fun getFileInfo(path: String): IFile = withContext(ioDispatcher) {
         val r = guard { repo.get(toDiskPath(path)) }
-        if (r.type != "file") throw IllegalStateException("Not a file")
+        if (r.type != "file") throw WallencException.Storage.NotAFile
         r.toCommonFile(path)
     }
 
     override suspend fun getDirInfo(path: String): IDirectory = withContext(ioDispatcher) {
         val r = guard { repo.get(toDiskPath(path)) }
-        if (r.type != "dir") throw IllegalStateException("Not a directory")
+        if (r.type != "dir") throw WallencException.Storage.NotADirectory
         r.toCommonDir(path)
     }
 
@@ -490,7 +497,7 @@ class YandexStorageAccessor(
             val diskPath = toDiskPath(acc)
             when (guard { repo.getOrNull(diskPath) }?.type) {
                 "dir" -> continue
-                "file" -> throw IllegalStateException("Path segment is a file: $acc")
+                "file" -> throw WallencException.Storage.PathIsFile
                 else -> guard { repo.createFolder(diskPath) }
             }
         }
@@ -498,7 +505,7 @@ class YandexStorageAccessor(
 
     override suspend fun delete(path: String) = withContext(ioDispatcher) {
         if (path == "/" || path.isBlank()) {
-            throw IllegalArgumentException("Deleting root path is forbidden")
+            throw WallencException.Storage.DeleteRootForbidden
         }
         val diskPath = toDiskPath(path)
         val prior = guard { repo.getOrNull(diskPath) }
@@ -531,14 +538,14 @@ class YandexStorageAccessor(
                     val diskPath = toDiskPath(path)
                     val prior = guard { repo.getOrNull(diskPath) }
                     if (prior?.type == "dir") {
-                        throw IllegalStateException("Cannot openWrite over directory: $path")
+                        throw WallencException.Storage.CannotWriteOverDirectory
                     }
                     val hadFile = prior?.type == "file"
                     val priorSize = if (prior?.type == "file") prior.size ?: 0L else 0L
                     guard { repo.uploadFile(diskPath, tmp, overwrite = true) }
                     val after = guard { getMetadataAfterWrite(diskPath) }
                     if (after.type != "file") {
-                        throw IllegalStateException("Expected file after upload: $path")
+                        throw WallencException.Storage.UnexpectedState
                     }
                     val newSize = after.size ?: 0L
                     _size.value = ((_size.value ?: 0L) + newSize - priorSize).coerceAtLeast(0L)
diff --git a/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/vaults/local/LocalVault.kt b/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/vaults/local/LocalVault.kt
index 2762d31..2629d1e 100644
--- a/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/vaults/local/LocalVault.kt
+++ b/domain-vault/src/main/java/com/github/nullptroma/wallenc/domain/vault/vaults/local/LocalVault.kt
@@ -1,5 +1,7 @@
 package com.github.nullptroma.wallenc.domain.vault.vaults.local
 
+import com.github.nullptroma.wallenc.domain.errors.WallencException
+
 import com.github.nullptroma.wallenc.domain.datatypes.StorageEncryptionInfo
 import com.github.nullptroma.wallenc.domain.interfaces.IStorage
 import com.github.nullptroma.wallenc.domain.vault.storages.local.LocalStorage
@@ -64,7 +66,7 @@ class LocalVault(
     private suspend fun readStorages() {
         val path = path.value
         if (path == null || !_isAvailable.value) {
-            throw Exception("Not available")
+            throw WallencException.Storage.NotAvailable
         }
 
         val dirs = path.listFiles()?.filter { it.isDirectory }
@@ -79,7 +81,7 @@ class LocalVault(
     override suspend fun createStorage(): LocalStorage = withContext(ioDispatcher) {
         val path = path.value
         if (path == null || !_isAvailable.value) {
-            throw Exception("Not available")
+            throw WallencException.Storage.NotAvailable
         }
 
         val storageUuid = UUID.randomUUID()
@@ -104,7 +106,7 @@ class LocalVault(
     override suspend fun remove(storage: IStorage) = withContext(ioDispatcher) {
         val path = path.value
         if (path == null || !_isAvailable.value) {
-            throw Exception("Not available")
+            throw WallencException.Storage.NotAvailable
         }
 
         val curStorages = _storages.value.toMutableList()
diff --git a/domain/src/main/java/com/github/nullptroma/wallenc/domain/errors/WallencException.kt b/domain/src/main/java/com/github/nullptroma/wallenc/domain/errors/WallencException.kt
new file mode 100644
index 0000000..6109d75
--- /dev/null
+++ b/domain/src/main/java/com/github/nullptroma/wallenc/domain/errors/WallencException.kt
@@ -0,0 +1,55 @@
+package com.github.nullptroma.wallenc.domain.errors
+
+/**
+ * Единая иерархия сбоев Wallenc. Ожидаемые бизнес-отказы (CanEncryptResult и т.п.)
+ * остаются отдельными sealed-типами; сюда попадают только операционные ошибки.
+ */
+sealed class WallencException(
+    message: String? = null,
+    cause: Throwable? = null,
+) : Exception(message, cause) {
+
+    sealed class Feature : WallencException() {
+        data object StorageNotFound : Feature()
+        data object NeedsDecryptedView : Feature()
+        data object SecretNotFound : Feature()
+        data object StorageNotWritable : Feature()
+    }
+
+    sealed class Storage(cause: Throwable? = null) : WallencException(cause = cause) {
+        data object NotAvailable : Storage()
+        data object FileNotFound : Storage()
+        data object IncorrectKey : Storage()
+        data class IoFailed(override val cause: Throwable) : Storage(cause)
+        data object EncInfoMissing : Storage()
+        data object NotEncrypted : Storage()
+        data object NotWritable : Storage()
+        data object NotAFile : Storage()
+        data object NotADirectory : Storage()
+        data object PathIsFile : Storage()
+        data object CannotWriteOverDirectory : Storage()
+        data object DeleteRootForbidden : Storage()
+        data object UnexpectedState : Storage()
+    }
+
+    /** Ошибки аутентификации (OAuth, токен), без привязки к провайдеру. */
+    sealed class Auth : WallencException() {
+        data object Failed : Auth()
+        data object TokenMissing : Auth()
+    }
+
+    /** Сетевые и удалённые операции (HTTP, блокировки, таймауты). */
+    sealed class Network(cause: Throwable? = null) : WallencException(cause = cause) {
+        data class HttpFailed(
+            val operation: String,
+            val statusCode: Int,
+            override val cause: Throwable? = null,
+        ) : Network(cause)
+        data class IoFailed(override val cause: Throwable) : Network(cause)
+        data object ResourceLocked : Network()
+        data object OperationFailed : Network()
+        data object OperationTimedOut : Network()
+    }
+
+    data class Unknown(override val cause: Throwable?) : WallencException(cause = cause)
+}
diff --git a/domain/src/main/java/com/github/nullptroma/wallenc/domain/errors/WallencExceptionMapping.kt b/domain/src/main/java/com/github/nullptroma/wallenc/domain/errors/WallencExceptionMapping.kt
new file mode 100644
index 0000000..9036181
--- /dev/null
+++ b/domain/src/main/java/com/github/nullptroma/wallenc/domain/errors/WallencExceptionMapping.kt
@@ -0,0 +1,13 @@
+package com.github.nullptroma.wallenc.domain.errors
+
+import java.io.FileNotFoundException
+import java.io.IOException
+
+fun Throwable.toWallencException(): WallencException = when (this) {
+    is WallencException -> this
+    is FileNotFoundException -> WallencException.Storage.FileNotFound
+    is IOException -> WallencException.Network.IoFailed(this)
+    else -> WallencException.Unknown(this)
+}
+
+fun Throwable.rethrowAsWallencException(): Nothing = throw toWallencException()
diff --git a/domain/src/main/java/com/github/nullptroma/wallenc/domain/tasks/TaskContext.kt b/domain/src/main/java/com/github/nullptroma/wallenc/domain/tasks/TaskContext.kt
index ea6c8b2..00fb1a7 100644
--- a/domain/src/main/java/com/github/nullptroma/wallenc/domain/tasks/TaskContext.kt
+++ b/domain/src/main/java/com/github/nullptroma/wallenc/domain/tasks/TaskContext.kt
@@ -1,5 +1,7 @@
 package com.github.nullptroma.wallenc.domain.tasks
 
+import com.github.nullptroma.wallenc.domain.errors.WallencException
+
 interface TaskContext {
     val taskId: TaskId
 
@@ -8,4 +10,6 @@ interface TaskContext {
     suspend fun reportProgress(progress: TaskProgress) = reportProgress(progress.fraction, progress.label)
 
     fun log(level: TaskLogLevel, message: String)
+
+    fun fail(error: WallencException): Nothing
 }
diff --git a/domain/src/main/java/com/github/nullptroma/wallenc/domain/tasks/TaskRunState.kt b/domain/src/main/java/com/github/nullptroma/wallenc/domain/tasks/TaskRunState.kt
index 6ea47e1..1ace453 100644
--- a/domain/src/main/java/com/github/nullptroma/wallenc/domain/tasks/TaskRunState.kt
+++ b/domain/src/main/java/com/github/nullptroma/wallenc/domain/tasks/TaskRunState.kt
@@ -1,9 +1,11 @@
 package com.github.nullptroma.wallenc.domain.tasks
 
+import com.github.nullptroma.wallenc.domain.errors.WallencException
+
 sealed class TaskRunState {
     data object Queued : TaskRunState()
     data class Running(val progress: TaskProgress?) : TaskRunState()
     data object Completed : TaskRunState()
     data object Cancelled : TaskRunState()
-    data class Failed(val message: String) : TaskRunState()
+    data class Failed(val error: WallencException) : TaskRunState()
 }
diff --git a/domain/src/test/java/com/github/nullptroma/wallenc/domain/errors/WallencExceptionMappingTest.kt b/domain/src/test/java/com/github/nullptroma/wallenc/domain/errors/WallencExceptionMappingTest.kt
new file mode 100644
index 0000000..7f19b61
--- /dev/null
+++ b/domain/src/test/java/com/github/nullptroma/wallenc/domain/errors/WallencExceptionMappingTest.kt
@@ -0,0 +1,39 @@
+package com.github.nullptroma.wallenc.domain.errors
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertSame
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import java.io.FileNotFoundException
+import java.io.IOException
+
+class WallencExceptionMappingTest {
+
+    @Test
+    fun preservesWallencException() {
+        val original = WallencException.Feature.StorageNotFound
+        assertSame(original, original.toWallencException())
+    }
+
+    @Test
+    fun mapsFileNotFoundException() {
+        val mapped = FileNotFoundException("missing").toWallencException()
+        assertEquals(WallencException.Storage.FileNotFound, mapped)
+    }
+
+    @Test
+    fun mapsIOExceptionToIoFailed() {
+        val cause = IOException("disk")
+        val mapped = cause.toWallencException()
+        assertTrue(mapped is WallencException.Network.IoFailed)
+        assertSame(cause, (mapped as WallencException.Network.IoFailed).cause)
+    }
+
+    @Test
+    fun mapsGenericExceptionToUnknown() {
+        val cause = Exception("boom")
+        val mapped = cause.toWallencException()
+        assertTrue(mapped is WallencException.Unknown)
+        assertSame(cause, (mapped as WallencException.Unknown).cause)
+    }
+}
diff --git a/task-runtime/src/main/java/com/github/nullptroma/wallenc/task/runtime/TaskOrchestrator.kt b/task-runtime/src/main/java/com/github/nullptroma/wallenc/task/runtime/TaskOrchestrator.kt
index 66832f8..a598b95 100644
--- a/task-runtime/src/main/java/com/github/nullptroma/wallenc/task/runtime/TaskOrchestrator.kt
+++ b/task-runtime/src/main/java/com/github/nullptroma/wallenc/task/runtime/TaskOrchestrator.kt
@@ -1,5 +1,7 @@
 package com.github.nullptroma.wallenc.task.runtime
 
+import com.github.nullptroma.wallenc.domain.errors.WallencException
+import com.github.nullptroma.wallenc.domain.errors.toWallencException
 import com.github.nullptroma.wallenc.domain.tasks.ITaskOrchestrator
 import com.github.nullptroma.wallenc.domain.tasks.PipelineState
 import com.github.nullptroma.wallenc.domain.tasks.PipelineTask
@@ -188,9 +190,13 @@ class TaskOrchestrator(
                 replaceTask(taskId) { it.copy(state = TaskRunState.Completed) }
             } catch (_: CancellationException) {
                 replaceTask(taskId) { it.copy(state = TaskRunState.Cancelled) }
+            } catch (e: TaskFailedException) {
+                replaceTask(taskId) {
+                    it.copy(state = TaskRunState.Failed(e.error))
+                }
             } catch (e: Exception) {
                 replaceTask(taskId) {
-                    it.copy(state = TaskRunState.Failed(e.message ?: e.toString()))
+                    it.copy(state = TaskRunState.Failed(e.toWallencException()))
                 }
             } finally {
                 cancelRequested.remove(taskId)
@@ -216,8 +222,14 @@ class TaskOrchestrator(
         override fun log(level: TaskLogLevel, message: String) {
             appendLog(level, message)
         }
+
+        override fun fail(error: WallencException): Nothing {
+            throw TaskFailedException(error)
+        }
     }
 
+    private class TaskFailedException(val error: WallencException) : RuntimeException()
+
     companion object {
         private const val MAX_LOG_LINES = 500
         private const val FOREGROUND_DELAY_MS = 1_000L
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/resources/AppStrings.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/resources/AppStrings.kt
new file mode 100644
index 0000000..84d3393
--- /dev/null
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/resources/AppStrings.kt
@@ -0,0 +1,86 @@
+package com.github.nullptroma.wallenc.ui.resources
+
+import com.github.nullptroma.wallenc.domain.errors.WallencException
+import com.github.nullptroma.wallenc.ui.R
+import com.github.nullptroma.wallenc.usecases.AddStorageToSyncGroupResult
+import com.github.nullptroma.wallenc.vault.contract.VaultLinkFailure
+
+fun WallencException.toUserNotification(): UserNotification.TextRes = when (this) {
+    WallencException.Feature.StorageNotFound ->
+        UserNotification.TextRes(R.string.error_storage_not_found)
+    WallencException.Feature.NeedsDecryptedView ->
+        UserNotification.TextRes(R.string.error_storage_locked_view)
+    WallencException.Feature.SecretNotFound ->
+        UserNotification.TextRes(R.string.error_secret_not_found)
+    WallencException.Feature.StorageNotWritable ->
+        UserNotification.TextRes(R.string.error_storage_not_writable)
+
+    WallencException.Storage.NotAvailable,
+    WallencException.Storage.NotWritable,
+    ->
+        UserNotification.TextRes(R.string.error_storage_not_writable)
+    WallencException.Storage.FileNotFound ->
+        UserNotification.TextRes(R.string.error_file_not_found)
+    WallencException.Storage.IncorrectKey ->
+        UserNotification.TextRes(R.string.error_incorrect_password)
+    WallencException.Storage.NotEncrypted ->
+        UserNotification.TextRes(R.string.error_storage_not_encrypted)
+    WallencException.Storage.EncInfoMissing ->
+        UserNotification.TextRes(R.string.error_enc_info_missing)
+    WallencException.Storage.DeleteRootForbidden ->
+        UserNotification.TextRes(R.string.error_delete_root_forbidden)
+    WallencException.Storage.NotAFile ->
+        UserNotification.TextRes(R.string.error_not_a_file)
+    WallencException.Storage.NotADirectory ->
+        UserNotification.TextRes(R.string.error_not_a_directory)
+    WallencException.Storage.PathIsFile ->
+        UserNotification.TextRes(R.string.error_path_is_file)
+    WallencException.Storage.CannotWriteOverDirectory ->
+        UserNotification.TextRes(R.string.error_cannot_write_over_directory)
+    WallencException.Storage.UnexpectedState ->
+        UserNotification.TextRes(R.string.error_unexpected_state)
+    is WallencException.Storage.IoFailed ->
+        UserNotification.TextRes(R.string.error_network)
+
+    WallencException.Auth.Failed,
+    WallencException.Auth.TokenMissing,
+    ->
+        UserNotification.TextRes(R.string.vault_link_error_auth)
+    WallencException.Network.ResourceLocked ->
+        UserNotification.TextRes(R.string.error_disk_resource_locked)
+    WallencException.Network.OperationFailed,
+    WallencException.Network.OperationTimedOut,
+    is WallencException.Network.HttpFailed,
+    is WallencException.Network.IoFailed,
+    ->
+        UserNotification.TextRes(R.string.error_network)
+
+    is WallencException.Unknown ->
+        UserNotification.TextRes(R.string.error_unknown)
+}
+
+fun VaultLinkFailure.toUserNotification(): UserNotification.TextRes = when (this) {
+    VaultLinkFailure.UnsupportedBrand ->
+        UserNotification.TextRes(R.string.vault_link_error_unsupported_brand)
+    VaultLinkFailure.NotRegistered ->
+        UserNotification.TextRes(R.string.vault_link_error_not_registered)
+    VaultLinkFailure.AuthError ->
+        UserNotification.TextRes(R.string.vault_link_error_auth)
+    VaultLinkFailure.Unknown ->
+        UserNotification.TextRes(R.string.vault_link_error_unknown)
+}
+
+fun AddStorageToSyncGroupResult.toUserNotification(groupId: String): UserNotification.TextRes = when (this) {
+    AddStorageToSyncGroupResult.Added ->
+        UserNotification.TextRes(R.string.sync_msg_storage_added, listOf(groupId))
+    AddStorageToSyncGroupResult.GroupNotFound ->
+        UserNotification.TextRes(R.string.sync_error_group_not_found)
+    AddStorageToSyncGroupResult.AlreadyInGroup ->
+        UserNotification.TextRes(R.string.sync_msg_storage_already_added)
+    AddStorageToSyncGroupResult.EncryptedStorageNotAllowed ->
+        UserNotification.TextRes(R.string.sync_msg_only_plain_storage_allowed)
+    AddStorageToSyncGroupResult.MissingEncryptionSecret ->
+        UserNotification.TextRes(R.string.sync_msg_storage_encryption_key_required)
+    AddStorageToSyncGroupResult.IncompatibleEncryption ->
+        UserNotification.TextRes(R.string.sync_msg_storage_incompatible_encryption)
+}
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/resources/UserNotificationCompose.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/resources/UserNotificationCompose.kt
new file mode 100644
index 0000000..72cd458
--- /dev/null
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/resources/UserNotificationCompose.kt
@@ -0,0 +1,16 @@
+package com.github.nullptroma.wallenc.ui.resources
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.res.stringResource
+
+@Composable
+fun UserNotification.resolveText(): String = when (this) {
+    is UserNotification.TextRes -> {
+        if (formatArgs.isEmpty()) {
+            stringResource(id)
+        } else {
+            stringResource(id, *formatArgs.toTypedArray())
+        }
+    }
+    is UserNotification.Plain -> message
+}
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/remotes/RemoteVaultsScreen.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/remotes/RemoteVaultsScreen.kt
index 4aad9a4..e3c5294 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/remotes/RemoteVaultsScreen.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/remotes/RemoteVaultsScreen.kt
@@ -46,6 +46,7 @@ import androidx.compose.ui.window.Dialog
 import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.github.nullptroma.wallenc.ui.R
+import com.github.nullptroma.wallenc.ui.resources.toUserNotification
 import com.github.nullptroma.wallenc.vault.contract.CloudBrand
 import com.github.nullptroma.wallenc.vault.contract.VaultLinkOutcome
 
@@ -211,9 +212,18 @@ fun RemoteVaultsScreen(
                                 when (outcome) {
                                     is VaultLinkOutcome.Success ->
                                         viewModel.onLinkSucceeded(outcome.registration)
-                                    is VaultLinkOutcome.Failed ->
-                                        Toast.makeText(context, outcome.message, Toast.LENGTH_LONG)
-                                            .show()
+                                    is VaultLinkOutcome.Failed -> {
+                                        val notification = outcome.reason.toUserNotification()
+                                        val text = if (notification.formatArgs.isEmpty()) {
+                                            context.getString(notification.id)
+                                        } else {
+                                            context.getString(
+                                                notification.id,
+                                                *notification.formatArgs.toTypedArray(),
+                                            )
+                                        }
+                                        Toast.makeText(context, text, Toast.LENGTH_LONG).show()
+                                    }
                                     VaultLinkOutcome.Cancelled -> { }
                                 }
                             }
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/StorageHomeScreen.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/StorageHomeScreen.kt
index 69d3f57..cbbe7b5 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/StorageHomeScreen.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/StorageHomeScreen.kt
@@ -27,6 +27,7 @@ import androidx.compose.ui.unit.dp
 import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.github.nullptroma.wallenc.ui.R
+import com.github.nullptroma.wallenc.ui.resources.resolveText
 
 @Composable
 fun StorageHomeScreen(
@@ -80,9 +81,9 @@ fun StorageHomeScreen(
                 ),
             )
 
-            uiState.errorMessage?.let {
+            uiState.errorNotification?.let { notification ->
                 Text(
-                    text = it,
+                    text = notification.resolveText(),
                     color = MaterialTheme.colorScheme.error,
                 )
             }
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/StorageHomeScreenState.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/StorageHomeScreenState.kt
index 82e6ebf..5df18a0 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/StorageHomeScreenState.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/StorageHomeScreenState.kt
@@ -1,6 +1,7 @@
 package com.github.nullptroma.wallenc.ui.screens.main.screens.storage
 
 import androidx.compose.runtime.Immutable
+import com.github.nullptroma.wallenc.ui.resources.UserNotification
 
 @Immutable
 data class StorageHomeScreenState(
@@ -13,5 +14,5 @@ data class StorageHomeScreenState(
     val twoFaCount: Int = 0,
     val textSecretsCount: Int = 0,
     val canManageDomainData: Boolean = false,
-    val errorMessage: String? = null,
+    val errorNotification: UserNotification.TextRes? = null,
 )
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/StorageHomeViewModel.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/StorageHomeViewModel.kt
index ec307b3..304c7e5 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/StorageHomeViewModel.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/StorageHomeViewModel.kt
@@ -2,7 +2,9 @@ package com.github.nullptroma.wallenc.ui.screens.main.screens.storage
 
 import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.viewModelScope
+import com.github.nullptroma.wallenc.domain.errors.WallencException
 import com.github.nullptroma.wallenc.ui.ViewModelBase
+import com.github.nullptroma.wallenc.ui.resources.toUserNotification
 import com.github.nullptroma.wallenc.usecases.FindStorageUseCase
 import com.github.nullptroma.wallenc.usecases.ManageTextSecretsUseCase
 import com.github.nullptroma.wallenc.usecases.ManageTwoFaTokensUseCase
@@ -33,7 +35,7 @@ class StorageHomeViewModel @Inject constructor(
                     state.value.copy(
                         isLoading = false,
                         storageUuid = storageUuid.toString(),
-                        errorMessage = "Storage not found",
+                        errorNotification = WallencException.Feature.StorageNotFound.toUserNotification(),
                     ),
                 )
                 return@launch
@@ -56,8 +58,8 @@ class StorageHomeViewModel @Inject constructor(
                     twoFaCount = twoFa.size,
                     textSecretsCount = secrets.size,
                     canManageDomainData = canManageDomainData,
-                    errorMessage = if (isRawEncrypted) {
-                        "Откройте расшифрованное отображение storage для работы с 2FA и секретами"
+                    errorNotification = if (isRawEncrypted) {
+                        WallencException.Feature.NeedsDecryptedView.toUserNotification()
                     } else {
                         null
                     },
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretDetailsScreen.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretDetailsScreen.kt
index 97ad0b1..3610ba8 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretDetailsScreen.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretDetailsScreen.kt
@@ -33,6 +33,7 @@ import androidx.compose.ui.unit.dp
 import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.github.nullptroma.wallenc.ui.R
+import com.github.nullptroma.wallenc.ui.resources.resolveText
 import kotlinx.coroutines.launch
 
 @Composable
@@ -58,8 +59,11 @@ fun TextSecretDetailsScreen(
                 .padding(16.dp),
             verticalArrangement = Arrangement.spacedBy(10.dp),
         ) {
-            uiState.errorMessage?.let {
-                Text(it, color = MaterialTheme.colorScheme.error)
+            uiState.errorNotification?.let { notification ->
+                Text(
+                    text = notification.resolveText(),
+                    color = MaterialTheme.colorScheme.error,
+                )
             }
             if (uiState.isMutating) {
                 LinearProgressIndicator(modifier = Modifier.fillMaxWidth())
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretDetailsScreenState.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretDetailsScreenState.kt
index 8fa8285..54f8a91 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretDetailsScreenState.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretDetailsScreenState.kt
@@ -1,6 +1,7 @@
 package com.github.nullptroma.wallenc.ui.screens.main.screens.storage.secrets
 
 import androidx.compose.runtime.Immutable
+import com.github.nullptroma.wallenc.ui.resources.UserNotification
 import com.github.nullptroma.wallenc.domain.datatypes.TextSecretRecord
 
 @Immutable
@@ -9,5 +10,5 @@ data class TextSecretDetailsScreenState(
     val isAvailable: Boolean = false,
     val isMutating: Boolean = false,
     val secret: TextSecretRecord? = null,
-    val errorMessage: String? = null,
+    val errorNotification: UserNotification.TextRes? = null,
 )
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretDetailsViewModel.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretDetailsViewModel.kt
index 73619cd..0dfdfa6 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretDetailsViewModel.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretDetailsViewModel.kt
@@ -6,7 +6,9 @@ import com.github.nullptroma.wallenc.domain.tasks.ITaskOrchestrator
 import com.github.nullptroma.wallenc.domain.tasks.TaskId
 import com.github.nullptroma.wallenc.domain.tasks.TaskRunState
 import com.github.nullptroma.wallenc.ui.R
+import com.github.nullptroma.wallenc.domain.errors.WallencException
 import com.github.nullptroma.wallenc.ui.ViewModelBase
+import com.github.nullptroma.wallenc.ui.resources.toUserNotification
 import com.github.nullptroma.wallenc.ui.resources.UiStringResolver
 import com.github.nullptroma.wallenc.ui.screens.main.screens.storage.requireStorageUuid
 import com.github.nullptroma.wallenc.usecases.FindStorageUseCase
@@ -44,7 +46,7 @@ class TextSecretDetailsViewModel @Inject constructor(
                 updateState(
                     state.value.copy(
                         isLoading = false,
-                        errorMessage = "Storage not found",
+                        errorNotification = WallencException.Feature.StorageNotFound.toUserNotification(),
                     ),
                 )
                 return@launch
@@ -54,7 +56,7 @@ class TextSecretDetailsViewModel @Inject constructor(
                     state.value.copy(
                         isLoading = false,
                         isAvailable = false,
-                        errorMessage = "Откройте расшифрованное отображение storage для просмотра и редактирования секрета",
+                        errorNotification = WallencException.Feature.NeedsDecryptedView.toUserNotification(),
                     ),
                 )
                 return@launch
@@ -75,7 +77,11 @@ class TextSecretDetailsViewModel @Inject constructor(
                     isAvailable = available,
                     isMutating = isMutating,
                     secret = secret,
-                    errorMessage = if (secret == null) "Secret not found" else null,
+                    errorNotification = if (secret == null) {
+                        WallencException.Feature.SecretNotFound.toUserNotification()
+                    } else {
+                        null
+                    },
                 )
             }.collect { ui ->
                 updateState(ui)
@@ -89,7 +95,7 @@ class TextSecretDetailsViewModel @Inject constructor(
             if (storage.metaInfo.value.encInfo != null && !storage.isVirtualStorage) {
                 updateState(
                     state.value.copy(
-                        errorMessage = "Откройте расшифрованное отображение storage для просмотра и редактирования секрета",
+                        errorNotification = WallencException.Feature.NeedsDecryptedView.toUserNotification(),
                     ),
                 )
                 return@launch
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretEditScreen.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretEditScreen.kt
index f63fc97..98e5b9a 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretEditScreen.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretEditScreen.kt
@@ -33,6 +33,7 @@ import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.github.nullptroma.wallenc.domain.datatypes.TextSecretEntryRecord
 import com.github.nullptroma.wallenc.ui.R
+import com.github.nullptroma.wallenc.ui.resources.resolveText
 
 @Composable
 fun TextSecretEditScreen(
@@ -42,7 +43,7 @@ fun TextSecretEditScreen(
 ) {
     val uiState by viewModel.state.collectAsStateWithLifecycle()
     val currentOnSaved by rememberUpdatedState(onSaved)
-    val inputEnabled = uiState.isAvailable && !uiState.isMutating && uiState.errorMessage == null
+    val inputEnabled = uiState.isAvailable && !uiState.isMutating && uiState.errorNotification == null
 
     var title by remember(uiState.initialSecret) {
         mutableStateOf(uiState.initialSecret?.title.orEmpty())
@@ -75,8 +76,8 @@ fun TextSecretEditScreen(
                     stringResource(R.string.text_secret_edit)
                 },
             )
-            uiState.errorMessage?.let { err ->
-                Text(text = err)
+            uiState.errorNotification?.let { notification ->
+                Text(text = notification.resolveText())
             }
             if (uiState.isMutating) {
                 LinearProgressIndicator(modifier = Modifier.fillMaxWidth())
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretEditScreenState.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretEditScreenState.kt
index 65fb957..ef13f4c 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretEditScreenState.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretEditScreenState.kt
@@ -1,6 +1,7 @@
 package com.github.nullptroma.wallenc.ui.screens.main.screens.storage.secrets
 
 import androidx.compose.runtime.Immutable
+import com.github.nullptroma.wallenc.ui.resources.UserNotification
 import com.github.nullptroma.wallenc.domain.datatypes.TextSecretRecord
 
 @Immutable
@@ -9,5 +10,5 @@ data class TextSecretEditScreenState(
     val isAvailable: Boolean = false,
     val isMutating: Boolean = false,
     val initialSecret: TextSecretRecord? = null,
-    val errorMessage: String? = null,
+    val errorNotification: UserNotification.TextRes? = null,
 )
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretEditViewModel.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretEditViewModel.kt
index 0895691..67941e2 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretEditViewModel.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretEditViewModel.kt
@@ -8,7 +8,9 @@ import com.github.nullptroma.wallenc.domain.tasks.ITaskOrchestrator
 import com.github.nullptroma.wallenc.domain.tasks.TaskId
 import com.github.nullptroma.wallenc.domain.tasks.TaskRunState
 import com.github.nullptroma.wallenc.ui.R
+import com.github.nullptroma.wallenc.domain.errors.WallencException
 import com.github.nullptroma.wallenc.ui.ViewModelBase
+import com.github.nullptroma.wallenc.ui.resources.toUserNotification
 import com.github.nullptroma.wallenc.ui.resources.UiStringResolver
 import com.github.nullptroma.wallenc.ui.screens.main.screens.storage.optionalSecretId
 import com.github.nullptroma.wallenc.ui.screens.main.screens.storage.requireStorageUuid
@@ -48,7 +50,7 @@ class TextSecretEditViewModel @Inject constructor(
                 updateState(
                     state.value.copy(
                         isLoading = false,
-                        errorMessage = "Storage not found",
+                        errorNotification = WallencException.Feature.StorageNotFound.toUserNotification(),
                     ),
                 )
                 return@launch
@@ -58,7 +60,7 @@ class TextSecretEditViewModel @Inject constructor(
                     state.value.copy(
                         isLoading = false,
                         isAvailable = false,
-                        errorMessage = "Откройте расшифрованное отображение storage для редактирования секрета",
+                        errorNotification = WallencException.Feature.NeedsDecryptedView.toUserNotification(),
                     ),
                 )
                 return@launch
@@ -78,7 +80,7 @@ class TextSecretEditViewModel @Inject constructor(
                     isAvailable = available,
                     isMutating = isMutating,
                     initialSecret = currentSecret,
-                    errorMessage = null,
+                    errorNotification = null,
                 )
             }.collect { ui ->
                 updateState(ui)
@@ -96,7 +98,7 @@ class TextSecretEditViewModel @Inject constructor(
             if (storage.metaInfo.value.encInfo != null && !storage.isVirtualStorage) {
                 updateState(
                     state.value.copy(
-                        errorMessage = "Откройте расшифрованное отображение storage для редактирования секрета",
+                        errorNotification = WallencException.Feature.NeedsDecryptedView.toUserNotification(),
                     ),
                 )
                 return@launch
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretsScreen.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretsScreen.kt
index 8b4e777..4ba02af 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretsScreen.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretsScreen.kt
@@ -33,6 +33,7 @@ import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.github.nullptroma.wallenc.domain.datatypes.TextSecretRecord
 import com.github.nullptroma.wallenc.ui.R
+import com.github.nullptroma.wallenc.ui.resources.resolveText
 
 @Composable
 fun TextSecretsScreen(
@@ -66,8 +67,11 @@ fun TextSecretsScreen(
                 .padding(16.dp),
             verticalArrangement = Arrangement.spacedBy(12.dp),
         ) {
-            uiState.errorMessage?.let {
-                Text(text = it, color = MaterialTheme.colorScheme.error)
+            uiState.errorNotification?.let { notification ->
+                Text(
+                    text = notification.resolveText(),
+                    color = MaterialTheme.colorScheme.error,
+                )
             }
 
             if (uiState.items.isEmpty()) {
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretsScreenState.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretsScreenState.kt
index 50cf6e2..47748ce 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretsScreenState.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretsScreenState.kt
@@ -1,6 +1,7 @@
 package com.github.nullptroma.wallenc.ui.screens.main.screens.storage.secrets
 
 import androidx.compose.runtime.Immutable
+import com.github.nullptroma.wallenc.ui.resources.UserNotification
 import com.github.nullptroma.wallenc.domain.datatypes.TextSecretRecord
 
 @Immutable
@@ -8,5 +9,5 @@ data class TextSecretsScreenState(
     val isLoading: Boolean = true,
     val isAvailable: Boolean = false,
     val items: List<TextSecretRecord> = emptyList(),
-    val errorMessage: String? = null,
+    val errorNotification: UserNotification.TextRes? = null,
 )
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretsViewModel.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretsViewModel.kt
index 32e1fe9..bc91cd2 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretsViewModel.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/secrets/TextSecretsViewModel.kt
@@ -2,7 +2,9 @@ package com.github.nullptroma.wallenc.ui.screens.main.screens.storage.secrets
 
 import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.viewModelScope
+import com.github.nullptroma.wallenc.domain.errors.WallencException
 import com.github.nullptroma.wallenc.ui.ViewModelBase
+import com.github.nullptroma.wallenc.ui.resources.toUserNotification
 import com.github.nullptroma.wallenc.ui.screens.main.screens.storage.requireStorageUuid
 import com.github.nullptroma.wallenc.usecases.FindStorageUseCase
 import com.github.nullptroma.wallenc.usecases.ManageTextSecretsUseCase
@@ -31,7 +33,7 @@ class TextSecretsViewModel @Inject constructor(
                 updateState(
                     state.value.copy(
                         isLoading = false,
-                        errorMessage = "Storage not found",
+                        errorNotification = WallencException.Feature.StorageNotFound.toUserNotification(),
                     ),
                 )
                 return@launch
@@ -41,7 +43,7 @@ class TextSecretsViewModel @Inject constructor(
                     state.value.copy(
                         isLoading = false,
                         isAvailable = false,
-                        errorMessage = "Откройте расшифрованное отображение storage для работы с секретами",
+                        errorNotification = WallencException.Feature.NeedsDecryptedView.toUserNotification(),
                     ),
                 )
                 return@launch
@@ -54,7 +56,7 @@ class TextSecretsViewModel @Inject constructor(
                     isLoading = false,
                     isAvailable = available,
                     items = items,
-                    errorMessage = null,
+                    errorNotification = null,
                 )
             }.collect { ui ->
                 updateState(ui)
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/twofa/TwoFaTokensScreen.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/twofa/TwoFaTokensScreen.kt
index 84f0d63..6964eda 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/twofa/TwoFaTokensScreen.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/twofa/TwoFaTokensScreen.kt
@@ -80,6 +80,7 @@ import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.github.nullptroma.wallenc.domain.datatypes.TwoFaTokenRecord
 import com.github.nullptroma.wallenc.ui.R
+import com.github.nullptroma.wallenc.ui.resources.resolveText
 import com.github.nullptroma.wallenc.ui.elements.QrScannerDialog
 import com.github.nullptroma.wallenc.usecases.TwoFaCodeState
 import com.github.nullptroma.wallenc.usecases.buildTwoFaCodeState
@@ -133,8 +134,11 @@ fun TwoFaTokensScreen(
                 return@Column
             }
 
-            uiState.errorMessage?.let {
-                Text(it)
+            uiState.errorNotification?.let { notification ->
+                Text(
+                    text = notification.resolveText(),
+                    color = MaterialTheme.colorScheme.error,
+                )
             }
 
             if (uiState.items.isEmpty()) {
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/twofa/TwoFaTokensScreenState.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/twofa/TwoFaTokensScreenState.kt
index 5cc51ae..32b19f6 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/twofa/TwoFaTokensScreenState.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/twofa/TwoFaTokensScreenState.kt
@@ -2,6 +2,7 @@ package com.github.nullptroma.wallenc.ui.screens.main.screens.storage.twofa
 
 import androidx.compose.runtime.Immutable
 import com.github.nullptroma.wallenc.domain.datatypes.TwoFaTokenRecord
+import com.github.nullptroma.wallenc.ui.resources.UserNotification
 
 @Immutable
 data class TwoFaTokensScreenState(
@@ -9,5 +10,5 @@ data class TwoFaTokensScreenState(
     val isAvailable: Boolean = false,
     val isMutating: Boolean = false,
     val items: List<TwoFaTokenRecord> = emptyList(),
-    val errorMessage: String? = null,
+    val errorNotification: UserNotification.TextRes? = null,
 )
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/twofa/TwoFaTokensViewModel.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/twofa/TwoFaTokensViewModel.kt
index 3868be2..86ceb15 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/twofa/TwoFaTokensViewModel.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/storage/twofa/TwoFaTokensViewModel.kt
@@ -6,7 +6,9 @@ import com.github.nullptroma.wallenc.domain.datatypes.TwoFaTokenRecord
 import com.github.nullptroma.wallenc.domain.tasks.ITaskOrchestrator
 import com.github.nullptroma.wallenc.domain.tasks.TaskRunState
 import com.github.nullptroma.wallenc.ui.R
+import com.github.nullptroma.wallenc.domain.errors.WallencException
 import com.github.nullptroma.wallenc.ui.ViewModelBase
+import com.github.nullptroma.wallenc.ui.resources.toUserNotification
 import com.github.nullptroma.wallenc.ui.resources.UiStringResolver
 import com.github.nullptroma.wallenc.ui.screens.main.screens.storage.requireStorageUuid
 import com.github.nullptroma.wallenc.usecases.FindStorageUseCase
@@ -40,7 +42,7 @@ class TwoFaTokensViewModel @Inject constructor(
                 updateState(
                     state.value.copy(
                         isLoading = false,
-                        errorMessage = "Storage not found",
+                        errorNotification = WallencException.Feature.StorageNotFound.toUserNotification(),
                     ),
                 )
                 return@launch
@@ -50,7 +52,7 @@ class TwoFaTokensViewModel @Inject constructor(
                     state.value.copy(
                         isLoading = false,
                         isAvailable = false,
-                        errorMessage = "Откройте расшифрованное отображение storage для работы с 2FA",
+                        errorNotification = WallencException.Feature.NeedsDecryptedView.toUserNotification(),
                     ),
                 )
                 return@launch
@@ -69,7 +71,7 @@ class TwoFaTokensViewModel @Inject constructor(
                     isAvailable = available,
                     isMutating = isMutating,
                     items = items,
-                    errorMessage = null,
+                    errorNotification = null,
                 )
             }.collect { ui ->
                 updateState(ui)
@@ -92,7 +94,7 @@ class TwoFaTokensViewModel @Inject constructor(
             if (storage.metaInfo.value.encInfo != null && !storage.isVirtualStorage) {
                 updateState(
                     state.value.copy(
-                        errorMessage = "Откройте расшифрованное отображение storage для работы с 2FA",
+                        errorNotification = WallencException.Feature.NeedsDecryptedView.toUserNotification(),
                     ),
                 )
                 return@launch
@@ -140,7 +142,7 @@ class TwoFaTokensViewModel @Inject constructor(
             if (storage.metaInfo.value.encInfo != null && !storage.isVirtualStorage) {
                 updateState(
                     state.value.copy(
-                        errorMessage = "Откройте расшифрованное отображение storage для работы с 2FA",
+                        errorNotification = WallencException.Feature.NeedsDecryptedView.toUserNotification(),
                     ),
                 )
                 return@launch
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/tasks/TaskPipelineScreen.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/tasks/TaskPipelineScreen.kt
index ce38d88..26ef34a 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/tasks/TaskPipelineScreen.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/tasks/TaskPipelineScreen.kt
@@ -36,6 +36,7 @@ import com.github.nullptroma.wallenc.domain.tasks.PipelineTask
 import com.github.nullptroma.wallenc.domain.tasks.TaskLogLevel
 import com.github.nullptroma.wallenc.domain.tasks.TaskRunState
 import com.github.nullptroma.wallenc.ui.R
+import com.github.nullptroma.wallenc.ui.resources.toUserNotification
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -191,7 +192,17 @@ private fun TaskRow(task: PipelineTask, isRunning: Boolean) {
                 progressLabel ?: stringResource(R.string.task_state_running)
             TaskRunState.Completed -> stringResource(R.string.task_state_completed)
             TaskRunState.Cancelled -> stringResource(R.string.task_state_cancelled)
-            is TaskRunState.Failed -> stringResource(R.string.task_state_failed, s.message)
+            is TaskRunState.Failed -> {
+                val notification = s.error.toUserNotification()
+                stringResource(
+                    R.string.task_state_failed,
+                    if (notification.formatArgs.isEmpty()) {
+                        stringResource(notification.id)
+                    } else {
+                        stringResource(notification.id, *notification.formatArgs.toTypedArray())
+                    },
+                )
+            }
         }
         Text(stateLabel, style = MaterialTheme.typography.bodySmall)
         if (task.state is TaskRunState.Running) {
diff --git a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/vault/AbstractVaultBrowserViewModel.kt b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/vault/AbstractVaultBrowserViewModel.kt
index 00350ec..f310a44 100644
--- a/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/vault/AbstractVaultBrowserViewModel.kt
+++ b/ui/src/main/java/com/github/nullptroma/wallenc/ui/screens/main/screens/vault/AbstractVaultBrowserViewModel.kt
@@ -21,8 +21,10 @@ import com.github.nullptroma.wallenc.usecases.StorageFileManagementUseCase
 import com.github.nullptroma.wallenc.ui.R
 import com.github.nullptroma.wallenc.ui.ViewModelBase
 import com.github.nullptroma.wallenc.ui.extensions.toPrintable
+import com.github.nullptroma.wallenc.domain.errors.toWallencException
 import com.github.nullptroma.wallenc.ui.resources.UiStringResolver
 import com.github.nullptroma.wallenc.ui.resources.UserNotification
+import com.github.nullptroma.wallenc.ui.resources.toUserNotification
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableSharedFlow
@@ -266,12 +268,7 @@ abstract class AbstractVaultBrowserViewModel(
                     }
                 } catch (e: Exception) {
                     ctx.log(TaskLogLevel.Error, e.message ?: "Failed to enable encryption")
-                    _userNotifications.emit(
-                        UserNotification.TextRes(
-                            R.string.msg_failed_enable_encryption,
-                            listOf(e.message ?: e.toString()),
-                        ),
-                    )
+                    emitTaskError(e)
                 }
             },
         )
@@ -296,12 +293,7 @@ abstract class AbstractVaultBrowserViewModel(
                     ctx.log(TaskLogLevel.Info, "Storage opened")
                 } catch (e: Exception) {
                     ctx.log(TaskLogLevel.Error, e.message ?: "Failed to open encrypted storage")
-                    _userNotifications.emit(
-                        UserNotification.TextRes(
-                            R.string.msg_failed_open_storage,
-                            listOf(e.message ?: e.toString()),
-                        ),
-                    )
+                    emitTaskError(e)
                 }
             },
         )
@@ -325,12 +317,7 @@ abstract class AbstractVaultBrowserViewModel(
                     ctx.log(TaskLogLevel.Info, "Storage closed")
                 } catch (e: Exception) {
                     ctx.log(TaskLogLevel.Error, e.message ?: "Failed to close encrypted storage")
-                    _userNotifications.emit(
-                        UserNotification.TextRes(
-                            R.string.msg_failed_close_storage,
-                            listOf(e.message ?: e.toString()),
-                        ),
-                    )
+                    emitTaskError(e)
                 }
             },
         )
@@ -359,12 +346,7 @@ abstract class AbstractVaultBrowserViewModel(
                     _userNotifications.emit(UserNotification.TextRes(R.string.msg_encryption_disabled))
                 } catch (e: Exception) {
                     ctx.log(TaskLogLevel.Error, e.message ?: "Failed")
-                    _userNotifications.emit(
-                        UserNotification.TextRes(
-                            R.string.msg_failed_disable_encryption,
-                            listOf(e.message ?: e.toString()),
-                        ),
-                    )
+                    emitTaskError(e)
                 }
             },
         )
@@ -464,17 +446,16 @@ abstract class AbstractVaultBrowserViewModel(
                     _userNotifications.emit(UserNotification.TextRes(R.string.msg_sync_lock_cleared))
                 } catch (e: Exception) {
                     ctx.log(TaskLogLevel.Error, e.message ?: "clear sync lock failed")
-                    _userNotifications.emit(
-                        UserNotification.TextRes(
-                            R.string.msg_sync_lock_clear_failed,
-                            listOf(e.message ?: e.toString()),
-                        ),
-                    )
+                    emitTaskError(e)
                 }
             },
         )
     }
 
+    private suspend fun emitTaskError(e: Exception) {
+        _userNotifications.emit(e.toWallencException().toUserNotification())
+    }
+
     private companion object {
         private const val TAG = "VaultBrowser"
     }
diff --git a/ui/src/main/res/values/strings.xml b/ui/src/main/res/values/strings.xml
index 1b8b3eb..68a9be8 100644
--- a/ui/src/main/res/values/strings.xml
+++ b/ui/src/main/res/values/strings.xml
@@ -154,6 +154,29 @@
     <string name="task_title_save_text_secret">Сохранение текстового секрета</string>
     <string name="task_title_delete_text_secret">Удаление текстового секрета</string>
 
+    <string name="error_storage_not_found">Хранилище не найдено</string>
+    <string name="error_storage_locked_view">Откройте расшифрованное отображение storage для работы с этим разделом</string>
+    <string name="error_secret_not_found">Секрет не найден</string>
+    <string name="error_storage_not_writable">Хранилище недоступно для записи</string>
+    <string name="error_file_not_found">Файл не найден</string>
+    <string name="error_incorrect_password">Неверный пароль</string>
+    <string name="error_storage_not_encrypted">Хранилище не зашифровано</string>
+    <string name="error_enc_info_missing">Отсутствуют метаданные шифрования</string>
+    <string name="error_delete_root_forbidden">Нельзя удалить корень хранилища</string>
+    <string name="error_not_a_file">Ожидался файл</string>
+    <string name="error_not_a_directory">Ожидалась папка</string>
+    <string name="error_path_is_file">Путь указывает на файл, а не на папку</string>
+    <string name="error_cannot_write_over_directory">Нельзя записать поверх папки</string>
+    <string name="error_unexpected_state">Хранилище в неожиданном состоянии</string>
+    <string name="error_network">Ошибка сети или сервера</string>
+    <string name="error_disk_resource_locked">Ресурс временно заблокирован. Повторите позже.</string>
+    <string name="error_unknown">Что-то пошло не так</string>
+    <string name="sync_error_group_not_found">Группа синхронизации не найдена</string>
+    <string name="vault_link_error_auth">Не удалось войти</string>
+    <string name="vault_link_error_not_registered">Вход не готов. Перезапустите приложение.</string>
+    <string name="vault_link_error_unknown">Не удалось войти</string>
+    <string name="vault_link_error_unsupported_brand">Этот провайдер не поддерживается</string>
+
     <string name="msg_encryption_enabled">Шифрование включено</string>
     <string name="msg_storage_already_encrypted">Хранилище уже зашифровано</string>
     <string name="msg_storage_not_empty">Хранилище не пустое</string>
diff --git a/ui/src/test/java/com/github/nullptroma/wallenc/ui/resources/WallencUserNotificationMappingTest.kt b/ui/src/test/java/com/github/nullptroma/wallenc/ui/resources/WallencUserNotificationMappingTest.kt
new file mode 100644
index 0000000..c0d5e10
--- /dev/null
+++ b/ui/src/test/java/com/github/nullptroma/wallenc/ui/resources/WallencUserNotificationMappingTest.kt
@@ -0,0 +1,27 @@
+package com.github.nullptroma.wallenc.ui.resources
+
+import com.github.nullptroma.wallenc.domain.errors.WallencException
+import com.github.nullptroma.wallenc.ui.R
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class WallencUserNotificationMappingTest {
+
+    @Test
+    fun mapsFeatureStorageNotFound() {
+        val notification = WallencException.Feature.StorageNotFound.toUserNotification()
+        assertEquals(R.string.error_storage_not_found, notification.id)
+    }
+
+    @Test
+    fun mapsStorageIncorrectKey() {
+        val notification = WallencException.Storage.IncorrectKey.toUserNotification()
+        assertEquals(R.string.error_incorrect_password, notification.id)
+    }
+
+    @Test
+    fun mapsUnknown() {
+        val notification = WallencException.Unknown(Exception("x")).toUserNotification()
+        assertEquals(R.string.error_unknown, notification.id)
+    }
+}
diff --git a/usecases/src/main/java/com/github/nullptroma/wallenc/usecases/RunStorageSyncUseCase.kt b/usecases/src/main/java/com/github/nullptroma/wallenc/usecases/RunStorageSyncUseCase.kt
index 5f858fb..634df77 100644
--- a/usecases/src/main/java/com/github/nullptroma/wallenc/usecases/RunStorageSyncUseCase.kt
+++ b/usecases/src/main/java/com/github/nullptroma/wallenc/usecases/RunStorageSyncUseCase.kt
@@ -1,5 +1,6 @@
 package com.github.nullptroma.wallenc.usecases
 
+import com.github.nullptroma.wallenc.domain.errors.toWallencException
 import com.github.nullptroma.wallenc.domain.interfaces.IStorageSyncEngine
 import com.github.nullptroma.wallenc.domain.tasks.ITaskOrchestrator
 import com.github.nullptroma.wallenc.domain.tasks.TaskId
@@ -46,8 +47,10 @@ class RunStorageSyncUseCase(
                         ctx.log(TaskLogLevel.Info, "Storage sync finished")
                         ctx.reportProgress(null, "Storage sync: completed")
                     } catch (e: Exception) {
-                        ctx.log(TaskLogLevel.Error, "Storage sync failed: ${e.message}")
-                        ctx.reportProgress(null, "Storage sync: failed - ${e.message}")
+                        val err = e.toWallencException()
+                        ctx.log(TaskLogLevel.Error, "Storage sync failed: $err")
+                        ctx.reportProgress(null, "Storage sync: failed - $err")
+                        ctx.fail(err)
                     } finally {
                         running.set(false)
                         _syncRunning.value = false
diff --git a/vault-contracts/src/main/java/com/github/nullptroma/wallenc/vault/contract/VaultLinkFailure.kt b/vault-contracts/src/main/java/com/github/nullptroma/wallenc/vault/contract/VaultLinkFailure.kt
new file mode 100644
index 0000000..2e48bc2
--- /dev/null
+++ b/vault-contracts/src/main/java/com/github/nullptroma/wallenc/vault/contract/VaultLinkFailure.kt
@@ -0,0 +1,8 @@
+package com.github.nullptroma.wallenc.vault.contract
+
+enum class VaultLinkFailure {
+    UnsupportedBrand,
+    NotRegistered,
+    AuthError,
+    Unknown,
+}
diff --git a/vault-contracts/src/main/java/com/github/nullptroma/wallenc/vault/contract/VaultLinkOutcome.kt b/vault-contracts/src/main/java/com/github/nullptroma/wallenc/vault/contract/VaultLinkOutcome.kt
index 1af8505..f38c720 100644
--- a/vault-contracts/src/main/java/com/github/nullptroma/wallenc/vault/contract/VaultLinkOutcome.kt
+++ b/vault-contracts/src/main/java/com/github/nullptroma/wallenc/vault/contract/VaultLinkOutcome.kt
@@ -13,6 +13,6 @@ sealed interface VaultLinkOutcome {
     /** Пользователь отменил вход. */
     data object Cancelled : VaultLinkOutcome
 
-    /** Ошибка SDK/сети/сервера; [message] годится для показа пользователю. */
-    data class Failed(val message: String) : VaultLinkOutcome
+    /** Ошибка SDK/сети/сервера; [reason] маппится в UI через [VaultLinkFailure]. */
+    data class Failed(val reason: VaultLinkFailure) : VaultLinkOutcome
 }