Issues with the Facebook Sign in

Hey, I've been trying to get the facebook sign in feature to work, but have been having trouble. I followed the documentation and got the App ID and APP Secret. I also put the App domain as the website and the site URL as the website with "http://www", but when I try to sign in with Facebook I get this error:

"There is an error retrieving your Facebook details. Facebook returns an error message of: "This IP can't make requests for that application."

I also attached an image of what the error looks like.

Is there something I am doing wrong?

Thanks for your time!