Devise with omniauth-facebook "Invalid Credentials"

Question

I'm trying to get Facebook authentication working with Devise through omniauth-facebook, I've followed the instructions here: https://github.com/plataformatec/devise/wiki/OmniAuth%3a-Overview

When I follow the login with Facebook link I am redirected to Facebook to login and accept the requested permissions.

I am then taken back to /users/sign_in with the error message "Could not authorize you from Facebook because "Invalid credentials""

Looking at the server logs the redirect comes from "/users/auth/facebook/callback?code=[long text string]" which is being processed with Users::OmniauthCallbacksController#failure rather than Users::OmniauthCallbacksController#facebook as I would have expected if it had worked.

Any suggestions as to why this is happening and how to resolve it much appreciated.

Answer 1

Ok, I had the very same issue. The reason for me turned out that I had defined this line in config/initializers/devise.rb:

config.omniauth :facebook ...

The app id and app secret were defined for my test Facebook app, and for production one. Fixing those id:s now fixed the problem.