403 forbidden with domain

I have a mirrored domain in my account: it is the domain http://www.filmers.net . This account is mirrored to an account with a index.php file in it. But when I request the domain http://www.filmers.net I get the following error:

You don’t have permission to access / on this server.

Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

What is the solution for this problem?