Mac Calendar "Server responded with an error" message

[MalagLagoon]

Someone sent me a calendar notification. You know the kind, you can press accept or decline. If you press accept then the date, time, and place get placed on your calendar. Well, all I get is "Server responded with an error" when I press accept. I f***ing hate this.

 

[MalagLagoon]

This appears to help

Reactivate Calendars

Try reactivating Calendars. This means that we will disconnect calendars from iCloud or Google in “System Preferences” and then reactive. Here is how:

1. Open System Preferences on your Mac.
2. Click Internet Accounts.
3. Select your calendar account (Google, AOL, iCloud, etc) that is giving you this error message.
4. Uncheck the “Calendars” box.
5. Now restart your Mac.
6. Now go to System Preferences and re-enable Calendars.

https://macreports.com/calendar-not-working-the-server-responded-with-an-error-fix/