diff --git a/rhodecode/lib/dbmigrate/migrate/exceptions.py b/rhodecode/lib/dbmigrate/migrate/exceptions.py
--- a/rhodecode/lib/dbmigrate/migrate/exceptions.py
+++ b/rhodecode/lib/dbmigrate/migrate/exceptions.py
@@ -71,6 +71,11 @@ class InvalidScriptError(ScriptError):
     """Invalid script error."""
 
 
+class InvalidVersionError(Error):
+    """Invalid version error."""
+
+# migrate.changeset
+
 class NotSupportedError(Error):
     """Not supported error"""