500 Internal error

The server encountered an unexpected condition which prevented it from fulfilling the request.

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Well,the error above occured when I tried to log in the mirrormanager to add a site,but one thing should be stressed
because I've login the system and the system required my second login(I never logout),I tried 2 times and then it just gave me this error.

What's wrong?

Yours sincerely,
Christopher Meng

Ambassador/Contributor of Fedora Project and many others.