ICal getting 404 error msg after Lion update

I updated Lion when it came out and now i've started getting a pop up message in my iCal that says: "The URL https://cal.me.com/principals/users/1.173073009/ encountered HTTP error 404. Make sure the URL is correct." Anyone know why or what to do about it? I've seen hundreds of these posted on the web, but no one has offered any answer as to why or a solution. Please help. It's VERY ANNOYING because my iCal keeps jumping up and down in the dock!

I'm having the same identical error message after installing Lion last night. I have had to resort to the app BusyCal until I can get this sorted out. I might add BusyCal has a much cleaner facade i.e. no fake leather surround ... yuck! It loaded all my current appointments from the iCal and syncs perfectly via the Cloud with my iPod and iPad 1.
If I secure any insight into this misque I'll post it promptly.

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