Error when accepting/rejecting an ical invitation "Couldn’t display event." - "This event could not be displayed because of a server error."

Hi migoka,

Thanks for contacting Apple Support Communities!

We understand that you're unable to accept or delete an event in your iCloud Calendar because of a server error.

To start, check out the troubleshooting steps outlined here to help to isolate this behavior further: If your iCloud Contacts, Calendars, or Reminders won’t sync

If you're still having trouble, let us know which device we're working with and if this happens with all calendar invites or if it's just this one invitation.

Take care!

@Miche11e_p I followed the troubleshooting guide, but still get the same error. Any ideas?