diff --git a/OpenPage/build/debug/main.js b/OpenPage/build/debug/main.js
index cc87a8b..f21837b 100644
--- a/OpenPage/build/debug/main.js
+++ b/OpenPage/build/debug/main.js
@@ -382,7 +382,7 @@
       // close the session
       return this.session.close(function(e) {
         if (e) {
-          return me.error("Cannot close session " + e);
+          return me.error(__("Cannot close session {0}", e));
         }
         me.editorSession.sessionController.getMetadataController().unsubscribe(gui.MetadataController.signalMetadataChanged, me.metaChanged);
         me.editorSession.sessionController.getUndoManager().unsubscribe(gui.UndoManager.signalDocumentModifiedChanged, me.documentChanged);
@@ -391,17 +391,17 @@
         // destry editorSession
         return me.editorSession.destroy(function(e) {
           if (e) {
-            return me.error("Cannot destroy editor session " + e);
+            return me.error(__("Cannot destroy editor session {0}", e));
           }
           me.editorSession = void 0;
           // destroy session
           return me.session.destroy(function(e) {
             if (e) {
-              return me.error("Cannot destroy document session " + e);
+              return me.error(__("Cannot destroy document session {0}", e));
             }
             core.Async.destroyAll([me.canvas.destroy], function(e) {
               if (e) {
-                return me.error("Cannot destroy canvas" + e);
+                return me.error(__("Cannot destroy canvas {0}", e));
               }
               return me.notify("Document closed");
             });
diff --git a/OpenPage/coffees/main.coffee b/OpenPage/coffees/main.coffee
index 010fcd0..70cbf75 100644
--- a/OpenPage/coffees/main.coffee
+++ b/OpenPage/coffees/main.coffee
@@ -274,20 +274,20 @@ class OpenPage extends this.OS.GUI.BaseApplication
         @session.enqueue [op]
         # close the session
         @session.close (e) ->
-            return (me.error "Cannot close session " + e) if e
+            return me.error __("Cannot close session {0}", e) if e
             me.editorSession.sessionController.getMetadataController().unsubscribe gui.MetadataController.signalMetadataChanged, me.metaChanged
             me.editorSession.sessionController.getUndoManager().unsubscribe gui.UndoManager.signalDocumentModifiedChanged, me.documentChanged
             me.directFormattingCtl.unsubscribe gui.DirectFormattingController.textStylingChanged, me.textStylingChanged
             me.directFormattingCtl.unsubscribe gui.DirectFormattingController.paragraphStylingChanged, me.textStylingChanged
             # destry editorSession
             me.editorSession.destroy (e) ->
-                return (me.error "Cannot destroy editor session " + e) if e
+                return me.error __("Cannot destroy editor session {0}", e) if e
                 me.editorSession = undefined
                 # destroy session
                 me.session.destroy (e) ->
-                    return (me.error "Cannot destroy document session " + e) if e
+                    return me.error __("Cannot destroy document session {0}", e) if e
                     core.Async.destroyAll [me.canvas.destroy], (e) ->
-                        return me.error "Cannot destroy canvas" + e if e
+                        return me.error __("Cannot destroy canvas {0}", e) if e
                         me.notify "Document closed"
                     me.session = undefined
                     me.directFormattingCtl = undefined