I have a problem restoring accounts from incremental backup.

I recently mounted a new volume to my system as /opt/zimbra/backup and copied all the backups to the new volume. Not sure if that could have caused this problem but restoring from a full backups is working fine.

When I select a users mailbox from one of the incremental backups in the list and try to do a restore I get the following error Can anyone pls. help:

Message: full backup required: incr-20070410.010009.549
com.zimbra.cs.backup.BackupServiceException: full backup required: incr-20070410.010009.549
at com.zimbra.cs.backup.BackupServiceException.FULL_B ACKUP_SESSION_REQUIRED(BackupServiceException.java :52)
at com.zimbra.cs.backup.FileBackupTarget.getAccountSe ssion(FileBackupTarget.java:307)
at com.zimbra.cs.backup.FileBackupTarget.restore(File BackupTarget.java:355)
at com.zimbra.cs.backup.BackupManager.restore(BackupM anager.java:444)
at com.zimbra.cs.service.backup.Restore.handle(Restor e.java:124)
at com.zimbra.soap.SoapEngine.dispatchRequest(SoapEng ine.java:262)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.jav a:162)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.jav a:84)
at com.zimbra.soap.SoapServlet.doPost(SoapServlet.jav a:223)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:709)
at com.zimbra.cs.servlet.ZimbraServlet.service(Zimbra Servlet.java:162)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:802)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invok e(StandardEngineValve.java:107)
at org.apache.catalina.valves.AccessLogValve.invoke(A ccessLogValve.java:541)
at org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11 ConnectionHandler.processConnection(Http11BaseProt ocol.java:667)
at org.apache.tomcat.util.net.PoolTcpEndpoint.process Socket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThr ead.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlR unnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)

Error code: backup.FULL_BACKUP_SESSION_REQUIRED
Method: ZmCsfeCommand.prototype.invoke
Details:soap:Sender