Bizarre message whenever I open my calendar

This is maddening. Why does my calendar version 10.0 start out with this pop up every day???

"The URL https://calendar.google.com/calendar/dav/[email protected]/user/ encountered HTTP error 404. Make sure the URL is correct."

Solution 1:

It is possible that you are trying to access a calendar link that was created before Google changed their URL formats (which was a long time ago). Old Google calendar links started with

https://www.google.com/calendar/dav/

Back in 2013, they changed the URL format to

https://apidata.googleusercontent.com/caldav/v2/your-email

I would suggest that firstly, you should delete any subscribed calendars (e.g. things like the "Public Holidays" calendar. If the problem persists, the next step would be to remove your account from the calendar app entirely, close the calendar app, then reopen and re-add your account details.

Make sure you've backed up your data first.