An Error Has Occurred!

[rember]

An Error Has Occurred!
Session verification failed. Please try logging out and back in again, and then try again. 

I Click "ADMIN" and "LOGOUT", it Show :

"An Error Has Occurred!
Session verification failed. Please try logging out and back in again, and then try again.  "

I can't Enter Management，
----------------------------------------------------

我英文说得不好，还是说中文好一点

我用管理员帐号登录后，当我点击"ADMIN"输入密码后点登录，他出现"An Error Has Occurred!
Session verification failed. Please try logging out and back in again, and then try again. "，所以我进不了后台。还有当我点LOGOUT也出现同样的错误提示？是怎么回事？