diff --git a/Implab/PromiseEventType.cs b/Implab/PromiseEventType.cs
--- a/Implab/PromiseEventType.cs
+++ b/Implab/PromiseEventType.cs
@@ -13,7 +13,9 @@ namespace Implab {
         /// <summary>
         /// Заврешено успешно, либо возникла ошибка.
         /// </summary>
-        Complete = 3
+        Complete = 3,
+
+        ErrorOrCancel = 6
     }
 }