Error:The system has not been taken off maintenance mode completely.

The system has not been taken off maintenance mode completely. Please contact your System Administrator.

Output:NORMAL

('MAINT'表示Maintainance模式开启，'NORMAL'表示Maintainance模式关闭)

最后解决方法：关闭IE，再打开EBS，错误就不见了，可能是IE缓存的问题。