Error when logging in

Hi There,

I’ve used your Plugin for some time now, but i’ve started to have some issues, all of a sudden.

When users try logging in, they get the following error: URL blocked: This redirect failed because the redirect URI is not white-listed in the app’s client OAuth settings. Make sure that the client and web OAuth logins are on and add all your app domains as valid OAuth redirect URIs.

This is on the Facebook Log-In. I have even set up a new App, and followed the guides, and documentation, but it just isn’t working at all for us. I’m baffled with whats causing this issue. I’ve double and triple checked all the settings and checked the OAuth URL’s are correct. But still no joy.

At the moment, no Users can access the site via their social media.
Any help is greatly appreciated.

Thanks

The page I need help with: [log in to see the link]