I have installed wordpress MU, and when I create a new

I have installed wordpress MU, and when I create a new site, I get an error code.
Internal Server Error

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

Please contact the server administrator and inform them of the time the error occurred, and the actions you performed just before this error.

I've also created a sub domain within Godaddy.
http://local5.bacu.ca/