Message Oracle ORA-27483 - string.string has an invalid END_DATE

ERRORstring.string has an invalid END_DATE
CAUSEAn attempt was made to enable a job or window that has an invalid end_date. Either the end_date is before the start_date or the end_date is in the past.
ACTIONAlter the job or window so that the end date becomes valid (possibly null) and then reissue the command.