SAP Message 50011 - Action manager: Customize action group '&1' correctly

Diagnosis
Customizing of the action manager for this list contains errors. Theerror is in action group &V1&.
No details concerning the cause of the error could be ascertained.

System Response
The user actions will not work correctly in this screen.

Procedure
The action manager definition for this list must be revised in the areaof action group &V1&.