The redirect URI in the request, http://www.gmslab.com/oauth/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/861557868086-qmlg8a1mr9rc56eh6nud8fkiq9u89pti.apps.googleusercontent.com?project=861557868086