The redirect URI in the request, https://www.plus4u.gr/social_auth/index.php, 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/578188421910-0oq5ifoutlr8gtchf41vbssqep3iqb20.apps.googleusercontent.com?project=578188421910