Internal Server Error

[MangeGamerZ]

Hello I attempted to set a Custom domain istand of my ip and i got clouldflare.. But every time i try to connect to my website with the url i get
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 anything you might have done that may have caused the error.

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