EXPLANATION This message should occur only on a down-level computer. Any action to correct the problem should be performed ...

EXPLANATION    This message should occur only on a down-level computer. Any action to correct the problem should be performed on that computer.  The schedule file contains a record with an invalid format.    ACTION    Restore the schedule file from a backup copy. If you do not have one, delete the AT schedule file and create a new one with the AT utility.