求救！在线等谢谢各位大神了！！

在登录Oracle时输入用户名密码后报错始终连接不上！
报错为：ORA-00604：error occurred at  recursive SQL level 1
                 ORA-30511：invalid DDL operation in system triggers
                 ORA-06512：at line 2
求大神指教跪谢！！！