diff --git a/lib/exception_util.dart b/lib/exception_util.dart
index 473dcae8..d843fa64 100644
--- a/lib/exception_util.dart
+++ b/lib/exception_util.dart
@@ -11,6 +11,8 @@ String toUserString(dynamic exception, BuildContext context) {
   if (exception is ApiException) {
     if (exception.response.statusCode == 401) {
       return AppLocalizations.of(context).errorUnauthenticated;
+    } else if (exception.response.statusCode == 423) {
+      return AppLocalizations.of(context).errorLocked;
     }
   } else if (exception is SocketException) {
     return AppLocalizations.of(context).errorDisconnected;
diff --git a/lib/l10n/app_en.arb b/lib/l10n/app_en.arb
index 5d75cf9e..a8a4f816 100644
--- a/lib/l10n/app_en.arb
+++ b/lib/l10n/app_en.arb
@@ -347,5 +347,9 @@
 	"errorDisconnected": "Unable to connect. Server may be offline or your device may be disconnected",
 	"@errorDisconnected": {
 		"description": "Error message when the app can't connect to the server"
+	},
+	"errorLocked": "File is locked on server. Please try again later",
+	"@errorLocked": {
+		"description": "Error message when server responds with HTTP423"
 	}
 }
\ No newline at end of file