ORA-30512: cannot modify string.string

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ORA-30512: cannot modify string.string more than once in a transaction
18-70 Oracle Database ErrorMessages
Cause: An attempt was madeto modify an object more than once in a transaction.
This error is usually caused by a DDL statement that fires a system triggerthat
tries to modify the same object. It can also happen when an attempt is made to
perform more than one DDL operation on a queue table in the same transaction
without issuing a commit between operations.
Action: Do not create systemtriggers that might modify an already modified
object. Also, do not specify more than one DDL operation on a queue table inthe
same transaction.