Zimbra is failing to synchronize with Yahoo and GMail address books. I keep getting error messages.

Product name: Zimbra Desktop
Product version: 1.0.4
Build ID: 1833
Release type: R
OS Platform: Windows Vista x86 6.1
Time of event: 2010-09-17 02:56:25
Error type: Unable to parse XML
Item ID: 7
Error summary: Yahoo address book synchronization failed

----------------------------------------------------------------------------
Affected data - PLEASE REMOVE ANY SENSITIVE INFORMATION (size=0):
----------------------------------------------------------------------------



----------------------------------------------------------------------------
Failure details - PLEASE REMOVE ANY SENSITIVE INFORMATION
----------------------------------------------------------------------------

java.io.IOException: Unable to parse XML
at com.zimbra.cs.offline.util.yab.Session.parseDocume nt(Session.java:150)
at com.zimbra.cs.offline.util.yab.Request.sendRequest (Request.java:97)
at com.zimbra.cs.offline.util.yab.Request.send(Reques t.java:55)
at com.zimbra.cs.offline.util.yab.SyncRequest.send(Sy ncRequest.java:79)
at com.zimbra.cs.offline.ab.yab.SyncSession.sync(Sync Session.java:100)
at com.zimbra.cs.offline.ab.yab.YabImport.importData( YabImport.java:70)
at com.zimbra.cs.offline.OfflineImport.importData(Off lineImport.java:88)
at com.zimbra.cs.offline.YMailImport.importData(YMail Import.java:59)
at com.zimbra.cs.datasource.DataSourceManager.importD ata(DataSourceManager.java:157)
at com.zimbra.cs.mailbox.LocalMailbox.importData(Loca lMailbox.java:417)
at com.zimbra.cs.mailbox.LocalMailbox.syncAllLocalDat aSources(LocalMailbox.java:389)
at com.zimbra.cs.mailbox.LocalMailbox.sync(LocalMailb ox.java:431)
at com.zimbra.cs.mailbox.LocalMailbox.syncOnTimer(Loc alMailbox.java:361)
at com.zimbra.cs.mailbox.DesktopMailbox$1.run(Desktop Mailbox.java:437)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
Caused by: org.xml.sax.SAXParseException: The entity name must immediately follow the '&' in the entity reference.
at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(U nknown Source)
at javax.xml.parsers.DocumentBuilder.parse(Unknown Source)
at com.zimbra.cs.offline.util.yab.Session.parseDocume nt(Session.java:148)
... 15 more

----------------------------------------------------------------------------