There was another post on the forum last week, cannot post comment, but I can't help with the error other than the standard suggestions of:
- try another browser (or, if you use them, turn off your ad-blocker and script-blocker and try again)
- make sure that you're using the latest version of the browser
- clear your cookies and internet cache
- use a different email address (Google doesn't like some email providers and I suspect, but don't know for sure, that Google provides the services for the comment section.)
Also, they implemented a VPN-blocker last week, per WR's post, so that might be an issue if you're using one.