The redirect URI in the request, http://app.prepscale.com/auth/google_oauth2/callback, 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/873318668140-bt5cp8g33lunk355jmeis0ebmbb5ol7a.apps.googleusercontent.com?project=873318668140