I'm in the process of upgrading a Liferay installation from 6.0.6 to 6.1-ee. The upgrade process always fails on the [VerifyProcess:76] Verifying com.liferay.portal.verify.VerifyJournal phase with the following stack trace

21:49:16,384 INFO [VerifyProcess:76] Verifying com.liferay.portal.verify.VerifyJournal
21:49:20,666 ERROR [MainServlet:201] com.liferay.portal.kernel.events.ActionException: com.liferay.portal.verify.VerifyException: com.liferay.portal.verify.VerifyException: com.liferay.portlet.journal.NoSuchStructureException: No JournalStructure exists with the key {groupId=10165, structureId=11432}
com.liferay.portal.kernel.events.ActionException: com.liferay.portal.verify.VerifyException: com.liferay.portal.verify.VerifyException: com.liferay.portlet.journal.NoSuchStructureException: No JournalStructure exists with the key {groupId=10165, structureId=11432}
at com.liferay.portal.events.StartupAction.run(StartupAction.java:57)
at com.liferay.portal.servlet.MainServlet.processStartupEvents(MainServlet.java:1193)
at com.liferay.portal.servlet.MainServlet.init(MainServlet.java:198)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1173)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:993)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4420)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4733)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:675)
at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:601)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:502)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1315)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1061)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: com.liferay.portal.verify.VerifyException: com.liferay.portal.verify.VerifyException: com.liferay.portlet.journal.NoSuchStructureException: No JournalStructure exists with the key {groupId=10165, structureId=11432}
at com.liferay.portal.verify.VerifyProcess.verify(VerifyProcess.java:82)
at com.liferay.portal.verify.VerifyProcessUtil._verifyProcess(VerifyProcessUtil.java:101)
at com.liferay.portal.verify.VerifyProcessUtil.verifyProcess(VerifyProcessUtil.java:66)
at com.liferay.portal.events.StartupHelper.verifyProcess(StartupHelper.java:79)
at com.liferay.portal.events.StartupHelperUtil.verifyProcess(StartupHelperUtil.java:44)
at com.liferay.portal.tools.DBUpgrader.verify(DBUpgrader.java:171)
at com.liferay.portal.events.StartupAction.doRun(StartupAction.java:164)
at com.liferay.portal.ee.license.StartupAction.doRun(Unknown Source)
at com.liferay.portal.events.StartupAction.run(StartupAction.java:51)
... 29 more
Caused by: com.liferay.portal.verify.VerifyException: com.liferay.portlet.journal.NoSuchStructureException: No JournalStructure exists with the key {groupId=10165, structureId=11432}
at com.liferay.portal.verify.VerifyProcess.verify(VerifyProcess.java:82)
at com.liferay.portal.verify.VerifyProcess.verify(VerifyProcess.java:89)
at com.liferay.portal.verify.VerifyProcessSuite.doVerify(VerifyProcessSuite.java:42)
at com.liferay.portal.verify.VerifyProcess.verify(VerifyProcess.java:79)
... 37 more
Caused by: com.liferay.portlet.journal.NoSuchStructureException: No JournalStructure exists with the key {groupId=10165, structureId=11432}
at com.liferay.portlet.journal.service.persistence.JournalStructurePersistenceImpl.findByG_S(JournalStructurePersistenceImpl.java:2155)
at com.liferay.portlet.journal.service.impl.JournalArticleLocalServiceImpl.checkStructure(JournalArticleLocalServiceImpl.java:2264)
at com.liferay.portlet.journal.service.impl.JournalArticleLocalServiceImpl.checkStructure(JournalArticleLocalServiceImpl.java:474)
at sun.reflect.GeneratedMethodAccessor212.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:115)
at com.liferay.portal.spring.transaction.TransactionInterceptor.invoke(TransactionInterceptor.java:86)
at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:60)
at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:60)
at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:60)
at com.liferay.portal.spring.aop.ServiceBeanAopProxy.invoke(ServiceBeanAopProxy.java:93)
at $Proxy172.checkStructure(Unknown Source)
at com.liferay.portlet.journal.service.JournalArticleLocalServiceUtil.checkStructure(JournalArticleLocalServiceUtil.java:368)
at com.liferay.portal.verify.VerifyJournal.doVerify(VerifyJournal.java:142)
at com.liferay.portal.verify.VerifyProcess.verify(VerifyProcess.java:79)
... 40 more
Stopping the server due to unexpected startup errors

I've tried to upgrade from the 6.0.6-ce installation to both 6.0-ee (liferay-portal-tomcat-6.0-ee-sp2-20110727) and 6.1.10-ee (liferay-portal-tomcat-6.1.10-ee-ga1-20120223174854827) and the same error occurs in both cases. The error also appears when I try to export all content from the 6.0.6-ce installation to a LAR file.

Any ideas what may cause this and how it can be fixed?