diff --git a/apps/documenteditor/forms/app/controller/ApplicationController.js b/apps/documenteditor/forms/app/controller/ApplicationController.js
index dd44cf4b3..f01fb18ae 100644
--- a/apps/documenteditor/forms/app/controller/ApplicationController.js
+++ b/apps/documenteditor/forms/app/controller/ApplicationController.js
@@ -253,6 +253,10 @@ define([
                     config.closable = false;
                     break;
 
+                case Asc.c_oAscError.ID.VKeyEncrypt:
+                    config.msg = this.errorToken;
+                    break;
+
                 case Asc.c_oAscError.ID.KeyExpire:
                     config.msg = this.errorTokenExpire;
                     break;
@@ -261,6 +265,26 @@ define([
                     config.msg = this.errorViewerDisconnect;
                     break;
 
+                case Asc.c_oAscError.ID.SessionAbsolute:
+                    config.msg = this.errorSessionAbsolute;
+                    break;
+
+                case Asc.c_oAscError.ID.SessionIdle:
+                    config.msg = this.errorSessionIdle;
+                    break;
+
+                case Asc.c_oAscError.ID.SessionToken:
+                    config.msg = this.errorSessionToken;
+                    break;
+
+                case Asc.c_oAscError.ID.UplImageUrl:
+                    config.msg = this.errorBadImageUrl;
+                    break;
+
+                case Asc.c_oAscError.ID.DataEncrypted:
+                    config.msg = this.errorDataEncrypted;
+                    break;
+
                 default:
                     config.msg = (typeof id == 'string') ? id : this.errorDefaultMessage.replace('%1', id);
                     break;
@@ -1708,7 +1732,13 @@ define([
         mniImageFromFile: 'Image from File',
         mniImageFromUrl: 'Image from URL',
         mniImageFromStorage: 'Image from Storage',
-        txtUntitled: 'Untitled'
+        txtUntitled: 'Untitled',
+        errorToken: 'The document security token is not correctly formed.<br>Please contact your Document Server administrator.',
+        errorSessionAbsolute: 'The document editing session has expired. Please reload the page.',
+        errorSessionIdle: 'The document has not been edited for quite a long time. Please reload the page.',
+        errorSessionToken: 'The connection to the server has been interrupted. Please reload the page.',
+        errorBadImageUrl: 'Image url is incorrect',
+        errorDataEncrypted: 'Encrypted changes have been received, they cannot be deciphered.',
 
     }, DE.Controllers.ApplicationController));
 
diff --git a/apps/documenteditor/forms/locale/en.json b/apps/documenteditor/forms/locale/en.json
index 854673b63..74a2135ed 100644
--- a/apps/documenteditor/forms/locale/en.json
+++ b/apps/documenteditor/forms/locale/en.json
@@ -117,6 +117,12 @@
   "DE.Controllers.ApplicationController.mniImageFromStorage": "Image from Storage",
   "DE.Controllers.ApplicationController.mniImageFromUrl": "Image from URL",
   "DE.Controllers.ApplicationController.txtUntitled": "Untitled",
+  "DE.Controllers.ApplicationController.errorToken": "The document security token is not correctly formed.<br>Please contact your Document Server administrator.",
+  "DE.Controllers.ApplicationController.errorSessionAbsolute": "The document editing session has expired. Please reload the page.",
+  "DE.Controllers.ApplicationController.errorSessionIdle": "The document has not been edited for quite a long time. Please reload the page.",
+  "DE.Controllers.ApplicationController.errorSessionToken": "The connection to the server has been interrupted. Please reload the page.",
+  "DE.Controllers.ApplicationController.errorBadImageUrl": "Image URL is incorrect",
+  "DE.Controllers.ApplicationController.errorDataEncrypted": "Encrypted changes have been received, they cannot be deciphered.",
   "DE.Views.ApplicationView.textClear": "Clear All Fields",
   "DE.Views.ApplicationView.textCopy": "Copy",
   "DE.Views.ApplicationView.textCut": "Cut",