XF 1.1 Facebook login error after upgrade

I'm getting this when I click facebook login on my forums now after upgrading.
  "error": {
      "message": "Error validating application.",
      "type": "OAuthException"
It was working before the upgrade.
Seems to be working now. I had to setup a new app for it, I'm not sure why though, the info from the old one was still there. Thanks for the help :)