[Help] ibProArcade v2.6.7 404 Error

Alright, so we have the arcade pretty much set up except when you click a game to play, we get this error message:
The requested URL /Forums/arcade.php was not found on this server.

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

We can open the arcade, and view the available games. We are using ibProArcade v2.6.7.

I'm using 3.7.4 btw.

[BobbyDiesel]

Can anybody give me any suggestions?