The redirect URI in the request, http://croatia.reachforchange.org/social/complete/google-oauth2/, does not match the ones authorized for the OAuth client. To update the authorized redirect URIs, visit: https://console.developers.google.com/apis/credentials/oauthclient/493027477716-q7g2975jo00k4kao9kc3td8t2ji7jgsa.apps.googleusercontent.com?project=493027477716