Likewise, I’m getting the same errors as reported above.
However, it appears that the developer’s website – where the plugin redirects via – is experiencing load issues which is likely the source of the problems. Visiting the Support page (http://www.wpadm.com/support/) I see the error:
Too many connections
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This reply was modified 7 years, 1 month ago by anotherdean.
This appears to have cleared as of today, so am marking this ticket as resolved.
I’m unsure of the cause of the resolution as I did nothing to this yesterday. Perhaps something was cached and that cleared or maybe there was some other oAuth lock that expired? Anyway, when I looked today the admin page was requesting confirmation of which Google account to connect instead of the 401 error page. Once reconnected everything is once again working.