ORA-27491: repeat_interval and start_date cannot both be NULL
Cause: An attempt was made to set both repeat_interval and start_date to equal NULL for a Scheduler window or schedule.
Action: If either repeat_interval or start_date is set to equal NULL, the other should be set to a non-NULL value.
ORA-27500
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ORA-27491repeat_interval and start_date cannot both be NULL