diff --git a/rhodecode/lib/exceptions.py b/rhodecode/lib/exceptions.py
--- a/rhodecode/lib/exceptions.py
+++ b/rhodecode/lib/exceptions.py
@@ -58,6 +58,10 @@ class StatusChangeOnClosedPullRequestErr
     pass
 
 
+class AttachedForksError(Exception):
+    pass
+
+
 class HTTPLockedRC(HTTPClientError):
     """
     Special Exception For locked Repos in RhodeCode, the return code can