Diagnosis
You deleted one or more columns of a table control.

System Response
The corresponding title elements have also been deleted, since theycould no longer be assigned to a table control column.

Procedure
If you no longer needed the title elements, you can ignore thiswarning. If, on the other hand, you want to retain them, undo thedeletion by choosing Edit -> Undo, and move the title elements to a newposition before deleting the original column elements.