Couldn't move your calendars to iCloud because an error occurred. Calendar and iCloud calendar are synched just fine -- still get this message
In Calendar I have been getting the message "Couldn't move your calendars to iCloud because an error occurred. Make sure you're connected to the Internet, and then try again." My Calendar and iCloud calendar are synched just fine -- and when I make a change to one the change instantly shows up on the other. IOS devices are fine.
I cannot find any reason for this -- I am connected to the Internet, of course. Cannot find anything in searches for this problem, though it does show up as a past question that has been asked.
Anyone have any suggestions?
FWIW ... OS x 10.9.5. Everything is up to date. MacBook Air, 2013 vintage.