Cause
Unexpected error from DBMS_LOCK.REQUEST
Unexpected error from DBMS_LOCK.REQUEST
This error should not normally occur. Check your system for anomalies and retry the operation. If this error persists, contact Oracle Support Services.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm
https://community.oracle.com/message/3229900
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