...exactly as the error describes, you're attempting to access a "non public" section of the site. If the site is down, try again tomorrow. If you're attempting to access a section of the site which is locked, then you'll need the correct permissions to get it done.
Since you've not given us a link to the site so we can test it, that's about the best we can do.
Hope this helps.
this keeps coming up
You don't have permission to access /index.php on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
is there anything I can do to fix the problem.