配置Oracle Streams时在删除进程出错ORA-26663

配置Streams时在删除进程出错ORA-26663:
SQL> exec dbms_apply_adm.drop_apply('TARGET_APPLY_STREAM');
BEGIN dbms_apply_adm.drop_apply('TARGET_APPLY_STREAM'); END;

*
ERROR at line 1:
ORA-26663: error queue for apply process ORA-26663: error queue for apply