Why do I get this and what am I supposed to do???
"500 Internal Server Error" Internal Server Error

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

Please contact the server administrator, root@localhost 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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Apache/2.2.3 (Red Hat) Server at www.thedoctorstv.com Port 80

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

Have you looked there? On Debian and Ubuntu, by default this will be /var/log/apache2/error.log, though that might have been changed in your Apache site configuration. This can be caused by many things - usually the log will have more details.