ERROR : calendar sync failed

[hitech73]

Objet: zdesktop error report (2011-03-07 14:51:49): service.INVALID_REQUEST

Product name: Zimbra Desktop
Product version: 2.0.1
Build ID: 10659
Release type: GA
OS Platform: Windows XP x86 5.1
Time of event: 2011-03-07 14:51:49
Error type: service.INVALID_REQUEST
Item ID: 11622
Error summary: calendar sync failed

Failure details - PLEASE REMOVE ANY SENSITIVE INFORMATION
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com.zimbra.common.service.ServiceException: invalid request: missing required element: appt
ExceptionId:sync-mbox-dbuburuz@regardaction.com:1299527509250:7702d5d214 8b6fff
Code:service.INVALID_REQUEST
at com.zimbra.common.service.ServiceException.INVALID _REQUEST(ServiceException.java:255)
at com.zimbra.common.soap.Element.checkNull(Element.j ava:243)
at com.zimbra.common.soap.Element.getElement(Element. java:170)
at com.zimbra.cs.mailbox.InitialSync.syncCalendarItem (InitialSync.java:603)
at com.zimbra.cs.mailbox.InitialSync.syncCalendarItem s(InitialSync.java:332)
at com.zimbra.cs.mailbox.InitialSync.initialFolderSyn c(InitialSync.java:247)
at com.zimbra.cs.mailbox.InitialSync.initialFolderSyn c(InitialSync.java:300)
at com.zimbra.cs.mailbox.InitialSync.initialFolderSyn c(InitialSync.java:300)
at com.zimbra.cs.mailbox.InitialSync.resume(InitialSy nc.java:198)
at com.zimbra.cs.mailbox.InitialSync.resume(InitialSy nc.java:182)
at com.zimbra.cs.mailbox.MailboxSync.sync(MailboxSync .java:177)
at com.zimbra.cs.mailbox.ZcsMailbox.sync(ZcsMailbox.j ava:119)
at com.zimbra.cs.mailbox.ZcsMailbox.syncOnTimer(ZcsMa ilbox.java:100)
at com.zimbra.cs.mailbox.SyncMailbox$1.run(SyncMailbo x.java:262)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)


Any know solutions, or clues to resolve problem

Thanks

Pat