ITunes 8.1 won't sync calendars to iPhone for me

I just installed iTunes 8.1(50) and am trying to synch my iPhone. It appears to synch everything except for calendars. After synching is completed, iTunes displays an alert saying: "iTunes could not sync calendars to iPhone 'Darrin's iPhone' because an error occurred while sending data from the iPhone." I have iPhone OS 2.2.1 installed. My console logs show this problem when the calendar sync fails:
3/15/09 12:33:10 PM AppleMobileSync[374] SyncServices precondition failure in [ISyncConcreteSession pushChangesFromRecord:withIdentifier:]: you can't push com.apple.calendars.Calendar records: -[ISyncSession shouldPushChangesForEntityName:] returned NO!
3/15/09 12:33:10 PM /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileSync.app/Contents/MacOS/AppleMobileSync[374] 374:2692704032|SyncClient.m:-[ConcreteSyncClient _processChangesFromDevice:dataClass:moreComing:]| ERROR: Exception pushing change for record 1/2:
Record = <CFDictionary 0x841870 [0xa08571a0]>{type = mutable, count = 3, capacity = 6, pairs = (
2 : <CFString 0xa0865180 [0xa08571a0]>{contents = "title"} = <CFString 0x85d870 [0xa08571a0]>{contents = "Home"}
5 : <CFString 0x85fa50 [0xa08571a0]>{contents = "com.apple.syncservices.RecordEntityName"} = <CFString 0x9ae670 [0xa08571a0]>{contents = "com.apple.calendars.Calendar"}
6 : <CFString 0x814240 [0xa08571a0]>{contents = "read only"} = <CFNumber 0x814500 [0xa08571a0]>{value = +0, type = kCFNumberSInt32Type}
3/15/09 12:33:10 PM /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileSync.app/Contents/MacOS/AppleMobileSync[374] 374:2692704032|SyncClient.m:-[ConcreteSyncClient processChangesFromDevice:dataClass:moreComing:info:]| ERROR: Canceling session, exception NSInvalidArgumentException pushing changes: [ISyncConcreteSession pushChangesFromRecord:withIdentifier:]: you can't push com.apple.calendars.Calendar records: -[ISyncSession shouldPushChangesForEntityName:] returned NO!
3/15/09 12:33:10 PM /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileSync.app/Contents/MacOS/AppleMobileSync[374] 374:2692704032|SyncClient.m:-[ConcreteSyncClient processChangesFromDevice:dataClass:moreComing:info:]| ERROR: Canceling session, exception NSInvalidArgumentException pushing changes: [ISyncConcreteSession pushChangesFromRecord:withIdentifier:]: you can't push com.apple.calendars.Calendar records: -[ISyncSession shouldPushChangesForEntityName:] returned NO!
3/15/09 12:33:10 PM [0x0-0x1f01f].com.apple.iTunes[306] 2009-03-15 12:33:10.288 AppleMobileSync[374:807] SyncServices precondition failure in [ISyncConcreteSession pushChangesFromRecord:withIdentifier:]: you can't push com.apple.calendars.Calendar records: -[ISyncSession shouldPushChangesForEntityName:] returned NO!
3/15/09 12:33:10 PM [0x0-0x1f01f].com.apple.iTunes[306] 2009-03-15 12:33:10.288 AppleMobileSync[374:807] SyncServices precondition failure in [ISyncConcreteSession pushChangesFromRecord:withIdentifier:]: you can't push com.apple.calendars.Calendar records: -[ISyncSession shouldPushChangesForEntityName:] returned NO!
3/15/09 12:33:13 PM [0x0-0x1f01f].com.apple.iTunes[306] Child: NULL command dict read, exiting...
Any idea what causes this and how to fix it?

dcardani, in the iPhone support forum a poster referenced this page: http://support.apple.com/kb/TS2654
It solved my problem. My calendars sync fine now. Try it.

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