"The server responded with an error" when modifying or deleting an item

I can't modify or edit an item in my MobileMe syncronized calendar. I can move the item to a different date or time, but if I try to delete it or remove an attendee, I get the following error:
The server responded with an error.
The request for “***” in “Calendar” in account ***.***@me.com” failed.
The server responded with
“500”
to operation CalDAVWriteEntityQueueableOperation.
I can't delete the item, or remove attendees from me.com either.
If I create another appointment, I can delete it, so I suspect it has something to do with the fact that I have invited attendees.
Any suggestions?

Are you behind a firewall at work or elsewhere?  Does you calendar sync with some other system like google (could be the google server is not responding)?  All we know from the message is that your mac cannot reach the server.  Maybe try later.  Are you using wifi or have an ethernet connection to the router?

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