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.  This alias no longer exists on the workstation that was receiving the alias's forwarded messages. The alias may have been deleted at that workstation, or the workstation may have been restarted.    ACTION    Restart the workstation or add the alias to the workstation again.