I usegoogle calender, but when I want to add an iCal account with my google account, it gives this notification. And does not sync.
(in English: The server responded with a Error.
is not a location that supports this request)
I think I have the same error - have you checked out this thread: https://discussions.apple.com/thread/4274995?start=75&tstart=0 - seems to give a lot of helpful background, including potential solutions, although in short it appears to be a Google Known Issue they're working on...
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