[Plugin:WP Social Plugin] Facebook login not working

Hi,

We are trying to integrate WP social Plugin into AuctionTheme in WordPress 3.8.1 and we are getting a white page with the following text when we try to sign up/login with facebook:

Forbidden

You don’t have permission to access /wp-content/plugins/wordpress-social-login/hybridauth/ on this server.

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

We get the same when we try to run the diagnostics so we cannot even run this.

Any suggestions? Quite urgent as client is waiting.

Many thanks,
Adam