Internal Server Error in Category

hi

i install a wordpress on my website every thing run ok

but when i Add a new Category, its give ne a reed massge saied

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@qleb.net 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.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

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Apache/1.3.39 Server at qleb.net Port 80

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haw can i fix this problem please guys help me i need to add alot of Category on my web wordpress

is it from the permission ? or what ?

thank you