ORA-29387: no top-plans found in the pending area
Cause: The VALIDATE_PENDING_AREA procedure found that either the intended top-plan(s) are involved in a loop or there are no top-plans
Action: Check all edges going from a subplan to the intended top-plan. Make sure the top plan does not have any plan referring to it
https://support.oracle.com/
http://www.oracle.com/