Hi all , my incremental backups fail with the below message . The full backups run once a week and the incremetal everyday. Please assist.

Label: incr-20120610.230014.102
Type: incremental
Status: completed (with errors)
Started: Mon, 2012/06/11 01:00:14.102 SAST
Ended: Mon, 2012/06/11 01:03:02.078 SAST
Redo log sequence range: 415 .. 415
Number of accounts: 391
Number of errors: 391


ERRORS

peter.pan@xyz.co.za: link(/mnt/zimbra/tmp/incr-20120610.230014.102/accounts/f16/4e7/f164e705-723b-42ed-97ee-1e38d1f2a8ed/ldap.xml, /mnt/zimbra/sessions/full-20120608.230004.927/accounts/f16/4e7/f164e705-723b-42ed-97ee-1e38d1f2a8ed/ldap_latest.xml): Invalid cross-device link
java.io.IOException: link(/mnt/zimbra/tmp/incr-20120610.230014.102/accounts/f16/4e7/f164e705-723b-42ed-97ee-1e38d1f2a8ed/ldap.xml, /mnt/zimbra/sessions/full-20120608.230004.927/accounts/f16/4e7/f164e705-723b-42ed-97ee-1e38d1f2a8ed/ldap_latest.xml): Invalid cross-device link
at com.zimbra.znative.IO.link0(Native Method)
at com.zimbra.znative.IO.link(IO.java:78)
at com.zimbra.cs.backup.util.Utils.link(Utils.java:21 3)
at com.zimbra.cs.backup.FileBackupTarget$BackupAcctSe ssion.incrementalBackup(FileBackupTarget.java:1859 )
at com.zimbra.cs.backup.BackupSet.startIncrementalBac kup(BackupSet.java:743)
at com.zimbra.cs.backup.FileBackupTarget$FileBackupSe t.startIncrementalBackup(FileBackupTarget.java:104 6)
at com.zimbra.cs.backup.BackupManager.backupIncrement al(BackupManager.java:324)
at com.zimbra.cs.service.backup.Backup.handleNetworkR equest(Backup.java:152)
at com.zimbra.cs.service.NetworkDocumentHandler.handl e(Unknown Source)
at com.zimbra.soap.SoapEngine.dispatchRequest(SoapEng ine.java:419)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.jav a:273)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.jav a:157)
at com.zimbra.soap.SoapServlet.doWork(SoapServlet.jav a:291)
at com.zimbra.soap.SoapServlet.doPost(SoapServlet.jav a:212)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:727)
at com.zimbra.cs.servlet.ZimbraServlet.service(Zimbra Servlet.java:182)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(Ser vletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedCha in.doFilter(ServletHandler.java:1166)
at com.zimbra.cs.servlet.SetHeaderFilter.doFilter(Set HeaderFilter.java:79)
at org.mortbay.jetty.servlet.ServletHandler$CachedCha in.doFilter(ServletHandler.java:1157)
at org.mortbay.servlet.UserAgentFilter.doFilter(UserA gentFilter.java:81)
at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter .java:155)
at org.mortbay.jetty.servlet.ServletHandler$CachedCha in.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(Se rvletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle( SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(Se ssionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(Co ntextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebA ppContext.java:418)
at org.mortbay.jetty.handler.ContextHandlerCollection .handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerCollection.handle (HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:152)
at org.mortbay.jetty.handler.rewrite.RewriteHandler.h andle(RewriteHandler.java:230)
at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:152)
at org.mortbay.jetty.handler.DebugHandler.handle(Debu gHandler.java:77)
at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(Htt pConnection.java:543)
at org.mortbay.jetty.HttpConnection$RequestHandler.co ntent(HttpConnection.java:939)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser. java:755)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpPa rser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnec tion.java:405)
at org.mortbay.io.nio.SelectChannelEndPoint.run(Selec tChannelEndPoint.java:409)
at org.mortbay.thread.BoundedThreadPool$PoolThread.ru n(BoundedThreadPool.java:451)