Admin user can't login - Internal Server Error

[luckestz]

Hello Guys,

After use a admin user sometimes without problems, I have this issue, when I try to login there are a message :

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Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@somenet.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

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I notice that the queues on the user are empty, in user profile

Its impossible to remove the user by the system too.

So how to solve this problem ?

[luckestz]

Another information, the error is showed only when I add the options read/write to admin group.

In stats or users groups the error don't occurs.