In Zimbra Desktop, I renamed a task

from: Contract Sanoma - Firstname van Lastname
to: Contract Sanoma JG Online - Firstname van Lastname

After this I get error reports:

Code:
Product name:    Zimbra Desktop
Product version: 0.91
Build ID:        1344
Release type:    BETA
OS Platform:     Linux i386 2.6.27-7-generic
Time of event:   2008-11-18 10:37:06
Error type:      service.FAILURE
Error summary:   calendar sync failed

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Affected data - PLEASE REMOVE ANY SENSITIVE INFORMATION (size=1361):
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<SetTaskRequest f="" t="" l="15" xmlns="urn:zimbraMail">
  <default ptst="NE">
    <m>
      <inv type="task" seq="1" compNum="0" id="1073741961">
        <tz stdoff="60" dayoff="120" id="(GMT+01.00) Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna">
          <standard sec="0" hour="3" wkday="1" min="0" mon="10" week="-1"/>
          <daylight sec="0" hour="2" wkday="1" min="0" mon="3" week="-1"/>
        </tz>
        <comp d="1226999891000" class="PUB" loc="" seq="1" uid="65f83828-cca1-40fb-a5eb-9f469136ad1b" status="NEED" allDay="1" isOrg="1" calItemId="107178" percentComplete="0" compNum="0" rsvp="0" x_uid="65f83828-cca1-40fb-a5eb-9f469136ad1b" name="Contract Sanoma JG Online - Thijs van Winsen" priority="5">
          <desc/>
          <or d="Bart Heinsius" a="myemail@mydomain.com" url="myemail@mydomain.com"/>
          <s d="20081116"/>
          <e d="20081116"/>
        </comp>
      </inv>
      <mp part="TEXT" ct="multipart/alternative" s="1360">
        <mp part="1" ct="text/plain" s="0">
          <content/>
        </mp>
        <mp part="2" ct="text/html" s="148">
          <content>&lt;div style="font-family:Arial; font-size: 10pt; color: #000000;">&lt;div style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 0);">&lt;/div>&lt;/div></content>
        </mp>
      </mp>
    </m>
  </default>
  <replies/>
</SetTaskRequest>

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Failure details:
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com.zimbra.common.service.ServiceException: system failure: Failed setting calendar item id=107178
ExceptionId:sync-timer-bheinsius@eom.nl:1227001026838:e71f9d88c4f25ca7
Code:service.FAILURE
        at com.zimbra.common.service.ServiceException.FAILURE(ServiceException.java:253)
        at com.zimbra.cs.mailbox.InitialSync.setCalendarItem(InitialSync.java:764)
        at com.zimbra.cs.mailbox.InitialSync.syncCalendarItem(InitialSync.java:621)
        at com.zimbra.cs.mailbox.DeltaSync.deltaSync(DeltaSync.java:242)
        at com.zimbra.cs.mailbox.DeltaSync.sync(DeltaSync.java:92)
        at com.zimbra.cs.mailbox.DeltaSync.sync(DeltaSync.java:76)
        at com.zimbra.cs.mailbox.MailboxSync.sync(MailboxSync.java:196)
        at com.zimbra.cs.mailbox.OfflineMailbox.sync(OfflineMailbox.java:116)
        at com.zimbra.cs.mailbox.OfflineMailbox.syncOnTimer(OfflineMailbox.java:97)
        at com.zimbra.cs.mailbox.DesktopMailbox$1.run(DesktopMailbox.java:259)
        at java.util.TimerThread.mainLoop(Unknown Source)
        at java.util.TimerThread.run(Unknown Source)
Caused by: com.zimbra.cs.mailbox.MailServiceException: No such blob: mailbox=5, item=107178, change=152812
ExceptionId:sync-timer-bheinsius@eom.nl:1227001026834:e71f9d88c4f25ca7
Code:mail.NO_SUCH_BLOB
        at com.zimbra.cs.mailbox.MailServiceException.NO_SUCH_BLOB(MailServiceException.java:264)
        at com.zimbra.cs.mailbox.MailItem.getBlob(MailItem.java:854)
        at com.zimbra.cs.mailbox.OfflineMailbox.syncChangeIds(OfflineMailbox.java:519)
        at com.zimbra.cs.mailbox.InitialSync.setCalendarItem(InitialSync.java:754)
        ... 10 more

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Deleting the item in Zimbra Desktop does not resolve the problem.

-Bart