The redirect URI in the request, http://sea.literatu.com/googleclassroom/oauth2callback/setupCommunity, 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/434143019188-i4madjvd8dpljctkj8kmnc6gsd5tgtr9.apps.googleusercontent.com?project=434143019188