Cause
the specified stop list already exists
the specified stop list already exists
must remove the duplicate stop list if you want to re-create it.
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/drgus.htm
https://community.oracle.com/message/10325299
https://community.oracle.com/message/1167413
https://community.oracle.com/message/3233309
https://community.oracle.com/message/1168533
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