Diagnosis
One of the following situations occurred to produce this error message:
You want to display the object management records for task listsentered for the change number you entered. However, none exist.
You are looking at the object overview and have just deleted all theobject management records.

Procedure
1)
If appropriate, create management records for the task lists. To dothis, choose menu Edit function New objects --> Tasklists and enter the task list concerned.