ORA-24005: must use DBMS_AQADM.DROP_QUEUE_TABLE to drop queue tables
Cause: An attempt was made to use the SQL command DROP TABLE for queue tables, but DROP TABLE is not supported for queue tables
Action: Use the DBMS_AQADM.DROP_QUEUE_TABLE procedure instead of the DROP TABLE command
https://support.oracle.com/
http://www.oracle.com/