我正在尝试将LOG4PLSQL的意外安装清除到错误的（即SYS）架构中。有一个QTAB_LOG需要删除的队列表。我已成功停止并删除了关联的队列：

call DBMS_AQADM.STOP_QUEUE('LOG_QUEUE');
call DBMS_AQADM.DROP_QUEUE('LOG_QUEUE');

但是删除队列表本身失败：

call DBMS_AQADM.DROP_QUEUE_TABLE('QTAB_LOG');

出现此错误：

SQL Error: ORA-00942: table or view does not exist
ORA-06512: at "SYS.DBMS_AQADM", line 240
ORA-06512: at line 1
00942. 00000 -  "table or view does not exist"

当然，以正常方式删除表格：

drop table QTAB_LOG;

不被允许：

SQL Error: ORA-24005: Inappropriate utilities used to perform DDL on AQ table LOG4PLSQL.QTAB_LOG
24005. 00000 -  "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.

我究竟做错了什么？