The redirect URI in the request, http://www.tchatt.net/login/?authenticate=google, 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/488133841918-7o084hu7h1q9sb4jneo9d7eh6filplsg.apps.googleusercontent.com?project=488133841918