Radipanel Help

I am trying to install radiPanel.

I have installed it without a hitch but i can not go into the sites. i get the error:

Quote:

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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, [email protected] 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 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

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The url is : http://*******.net/radipanel/core.changePassword

I have made sure the htaccess is correct and the host allows mod-rewrite.
any ideas?

Jhawsh