diff --git a/bindings/dart/lib/exception.dart b/bindings/dart/lib/exception.dart
index cb522948..08d931f9 100644
--- a/bindings/dart/lib/exception.dart
+++ b/bindings/dart/lib/exception.dart
@@ -25,6 +25,7 @@ class OuisyncException implements Exception {
         ErrorCode.permissionDenied => PermissionDenied(message, sources),
         ErrorCode.serviceAlreadyRunning =>
           ServiceAlreadyRunning(message, sources),
+        ErrorCode.unsupported => Unsupported(message, sources),
         ErrorCode.vfsDriverInstallError =>
           VFSDriverInstallError(message, sources),
         _ => OuisyncException._(code, message, sources),
@@ -34,9 +35,9 @@ class OuisyncException implements Exception {
   String toString() => [message].followedBy(sources).join(' → ');
 }
 
-class PermissionDenied extends OuisyncException {
-  PermissionDenied([String? message, List<String> sources = const []])
-      : super._(ErrorCode.permissionDenied, message, sources);
+class AlreadyExists extends OuisyncException {
+  AlreadyExists([String? message, List<String> sources = const []])
+      : super._(ErrorCode.alreadyExists, message, sources);
 }
 
 class InvalidData extends OuisyncException {
@@ -44,21 +45,26 @@ class InvalidData extends OuisyncException {
       : super._(ErrorCode.invalidData, message, sources);
 }
 
-class AlreadyExists extends OuisyncException {
-  AlreadyExists([String? message, List<String> sources = const []])
-      : super._(ErrorCode.alreadyExists, message, sources);
-}
-
 class NotFound extends OuisyncException {
   NotFound([String? message, List<String> sources = const []])
       : super._(ErrorCode.notFound, message, sources);
 }
 
+class PermissionDenied extends OuisyncException {
+  PermissionDenied([String? message, List<String> sources = const []])
+      : super._(ErrorCode.permissionDenied, message, sources);
+}
+
 class ServiceAlreadyRunning extends OuisyncException {
   ServiceAlreadyRunning([String? message, List<String> sources = const []])
       : super._(ErrorCode.serviceAlreadyRunning, message, sources);
 }
 
+class Unsupported extends OuisyncException {
+  Unsupported([String? message, List<String> sources = const []])
+      : super._(ErrorCode.unsupported, message, sources);
+}
+
 class VFSDriverInstallError extends OuisyncException {
   VFSDriverInstallError([String? message, List<String> sources = const []])
       : super._(ErrorCode.vfsDriverInstallError, message, sources);
diff --git a/bindings/kotlin/lib/src/main/kotlin/org/equalitie/ouisync/lib/Error.kt b/bindings/kotlin/lib/src/main/kotlin/org/equalitie/ouisync/lib/Error.kt
index f4deab74..1eb809b6 100644
--- a/bindings/kotlin/lib/src/main/kotlin/org/equalitie/ouisync/lib/Error.kt
+++ b/bindings/kotlin/lib/src/main/kotlin/org/equalitie/ouisync/lib/Error.kt
@@ -16,6 +16,7 @@ open class Error internal constructor(
             ErrorCode.NOT_FOUND -> NotFound(message, sources)
             ErrorCode.STORE_ERROR -> StoreError(message, sources)
             ErrorCode.SERVICE_ALREADY_RUNNING -> ServiceAlreadyRunning(message, sources)
+            ErrorCode.UNSUPPORTED -> Unsupported(message, sources)
             else -> Error(code, message, sources)
         }
     }
@@ -36,4 +37,6 @@ open class Error internal constructor(
 
     class ServiceAlreadyRunning(message: String? = null, sources: List<String> = emptyList()) :
         Error(ErrorCode.SERVICE_ALREADY_RUNNING, message, sources)
+
+    class Unsupported(message: String? = null, sources: List<String> = emptyList()) : Error(ErrorCode.UNSUPPORTED, message, sources)
 }