trouble with facebook integration

Hi, I am having real trouble integrating easyblog with my facebook business page. I am a bit of a newbie here so I am sorry in advance if I am doing something wrong! I have created a facebook app and have copied the app id and secret to the step 1 of easyblog autoposting section. in step 2 (You will need to login with your Facebook account now and grant authorization for the application) when i try and sign in to facebook I get this message:

Given URL is not allowed by the Application configuration.: One or more of the given URLs is not allowed 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.

Please help!

Thanks

Rob