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30511, 00000, "invalid DDL operation in system triggers" // *Cause: An attempt was made to perform an invalid DDL operation // in a system trigger. Most DDL operations currently are not // supported in system triggers. The only currently supported DDL // operations are table operations and ALTER?COMPILE operations. // *Action: Remove invalid DDL operations in system triggers.
For that account,it has trigger. that's why it is raising the trigger.
i.e database level trigger ..ask dba to resolve this one.