Facebook Auth error

Given URL is not permitted by the Application configuration: One or more of the given URLs is not permitted by the App’s settings. It must match the Website URL or Canvas URL, or the domain must be a subdomain of one of the App’s domains.

This is what I get when I try login to my app. I had it working before on my localhost, but now its on a live server. I tried removing the accounts-facebook package and start again it didnt work.

Both the App Domain and Site URL is set to http://www.myapp.com/

Anyway to fix this?
Is there a setting I need to change? Or remove the package clearly?