Hi,
Everyone sharing this calendar is running into this error (but not always) and it is causing double-work, which is frustrating obvisouly. It's based on a sheet currently, and the users have the edit access to the columns included in the calendar. I am the owner of the sheet and it still happens to me once in a while.
So an editor makes a change, s/he gets the error, and the calendar automatically refreshes and the change is gone. Redo and then usually the 2nd try appears to work.
I have found some discussion threads of this error, but none of them pertained to my situation.
Thank you!
Ok Hee