My ical is constantly giving this error message: The server responded with "400" to operation CalDAVScheduleEventQueueableOperation.   Go Offline   Revert to Server . What does it mean? It´s driving me nuts.

I am syncing to Icloud. Iphone and Ipad works fine with this setup, but my Macbook Pro just doesn´t seem to get it. I have all latest updates. I can not detect any different response from the Mac weather I click <Go offline> or I click <Revert to server>, but the message comes up about 50 times a day(!).
Also - I seem to have a problem answering to some invitations (I invite myself from my work calendar (win Outlook). Shouldn´t I be able to answer them ?

I am having this problem too...and also I (most of the time) can't invite anyone on my google apps domain to a meeting. WEIRD! HELP!!! I just switched to Mac from PC...this was supposed to be EASY!
I get all kinds of error  messages...
1) The request for “Test Appointment” in “[email protected]” in account “yyyy.com Google” failed.  The server responded with “400” to operation CalDAVScheduleEventQueueableOperation. *My google calendar *IS* updated despite the error, but the appointment is greyed out on my calendar.
2)  The URL https://calendar.google.com/calendar/dav/[email protected]/user///calendar.google.com/calendar/dav/[email protected]/user/ encountered HTTP error 404. Make sure the URL is correct. The URL *IS* correct.
Also, when I try to invite people to appointments, iCal adds random attendees and frequently will not add an attendee if they are in my domain. HELP.

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