Oracle Error ORA-24063: cannot downgrade QUEUE_TABLE that has queues with rule-based subscribers

Oracle Error Message

ORA-24063: cannot downgrade QUEUE_TABLE that has queues with rule-based subscribers

Reason for the Error

An attempt was made to downgrade the queue table when there were queues on which rule based subscribers are defined.

Solution

Remove the rule based subscribers for all queues in this queue table and retry.