Why does it always happen to me?
This happens after my application verify for user user login and redirect user to the authentication page:
https://w
This was happening to me also but all the api keys, secrets and stuff were correct. What I found is that my app was running in sandbox mode. Go to your app settings in https://developers.facebook.com/ click the advanced settings tab and check to see if your app is in sandbox mode. If it is disable it and try again. Let us know if it works.