Appointments + Google Calendar API

For the life of me, I cannot get this plug in working. Every time I try to “generate my access code” I get this:

401. That’s an error.

Error: deleted_client

The OAuth client was deleted.

Request Details

access_type=offline

approval_prompt=auto

scope=https://www.googleapis.com/auth/calendar

response_type=code

redirect_uri=urn:ietf:wg:oauth:2.0:oob

client_id=XXXXXXXXXXXX-02khp8oqukv0mrlaoqr94qo1v9apcvtr.apps.googleusercontent.com

That’s all we know.

Please help!