How do I cure this error in calendar?

Can you help me cure this error.  I have tried restarting.
The URL https://caldav.calendar.yahoo.com/principals/users/[email protected]///caldav.calendar.yahoo.com/principals/users/[email protected]/ encountered HTTP error 404. Make sure the URL is correct.
Thank you!
Ed

The 404 or Not Found error message is a HTTP standard response code indicating that the client was able to communicate with a given server, but the server could not find what was requested.
However when I clicked on the link you provided, it asked for a user name and password. When Calendar is trying to connect it can't get past the login page so gives you the 404 error.

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