12:51:51,003 ERROR [liferay/background_task-1][BackgroundTaskMessageListener:137] Unable to execute background task com.liferay.portal.kernel.lar.PortletDataException: com.thoughtworks.xstream.mapper.CannotResolveClassException: com.liferay.portlet.messageboards.model.impl.MBMessageImpl at com.liferay.portal.kernel.lar.BaseStagedModelDataHandler.importStagedModel(BaseStagedModelDataHandler.java:243) 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:606) at com.liferay.portal.kernel.bean.ClassLoaderBeanHandler.invoke(ClassLoaderBeanHandler.java:67) at com.sun.proxy.$Proxy442.importStagedModel(Unknown Source) at com.liferay.portal.kernel.lar.StagedModelDataHandlerUtil.importStagedModel(StagedModelDataHandlerUtil.java:299) at com.liferay.portal.kernel.lar.StagedModelDataHandlerUtil.importStagedModel(StagedModelDataHandlerUtil.java:289) at com.liferay.calendar.lar.CalendarPortletDataHandler.doImportData(CalendarPortletDataHandler.java:184) at com.liferay.portal.kernel.lar.BasePortletDataHandler.importData(BasePortletDataHandler.java:409) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at com.liferay.portal.kernel.bean.ClassLoaderBeanHandler.invoke(ClassLoaderBeanHandler.java:67) at com.sun.proxy.$Proxy441.importData(Unknown Source) at com.liferay.portal.lar.PortletImporter.importPortletData(PortletImporter.java:180) at com.liferay.portal.lar.PortletImporter.importPortletData(PortletImporter.java:627) at com.liferay.portal.lar.LayoutImporter.doImportLayouts(LayoutImporter.java:649) at com.liferay.portal.lar.LayoutImporter.importLayouts(LayoutImporter.java:127) at com.liferay.portal.service.impl.LayoutLocalServiceImpl.importLayouts(LayoutLocalServiceImpl.java:1866) at com.liferay.portal.service.impl.LayoutLocalServiceImpl.importLayouts(LayoutLocalServiceImpl.java:1915) 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:606) at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:115) at com.liferay.portal.service.impl.LayoutLocalServiceVirtualLayoutsAdvice.invoke(LayoutLocalServiceVirtualLayoutsAdvice.java:183) at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:111) at com.liferay.portal.service.impl.LayoutLocalServiceStagingAdvice.invoke(LayoutLocalServiceStagingAdvice.java:140) at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:111) at com.liferay.portal.spring.transaction.DefaultTransactionExecutor.execute(DefaultTransactionExecutor.java:62) at com.liferay.portal.spring.transaction.TransactionInterceptor.invoke(TransactionInterceptor.java:55) at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:111) at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:56) at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:111) at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:56) at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:111) at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:56) at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:111) at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:56) at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:111) at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:56) at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:111) at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:56) at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:111) at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:56) at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:111) at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:56) at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:111) at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:56) at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:111) at com.liferay.portal.spring.aop.ServiceBeanAopProxy.invoke(ServiceBeanAopProxy.java:175) at com.sun.proxy.$Proxy66.importLayouts(Unknown Source) at com.liferay.portal.service.LayoutLocalServiceUtil.importLayouts(LayoutLocalServiceUtil.java:1362) at com.liferay.portal.lar.backgroundtask.LayoutImportBackgroundTaskExecutor.execute(LayoutImportBackgroundTaskExecutor.java:61) at com.liferay.portal.kernel.backgroundtask.SerialBackgroundTaskExecutor.execute(SerialBackgroundTaskExecutor.java:56) at com.liferay.portal.backgroundtask.messaging.BackgroundTaskMessageListener.doReceive(BackgroundTaskMessageListener.java:111) at com.liferay.portal.kernel.messaging.BaseMessageListener.receive(BaseMessageListener.java:26) at com.liferay.portal.kernel.messaging.InvokerMessageListener.receive(InvokerMessageListener.java:72) at com.liferay.portal.kernel.messaging.ParallelDestination$1.run(ParallelDestination.java:71) at com.liferay.portal.kernel.concurrent.ThreadPoolExecutor$WorkerTask._runTask(ThreadPoolExecutor.java:682) at com.liferay.portal.kernel.concurrent.ThreadPoolExecutor$WorkerTask.run(ThreadPoolExecutor.java:593) at java.lang.Thread.run(Thread.java:724) Caused by: com.thoughtworks.xstream.mapper.CannotResolveClassException: com.liferay.portlet.messageboards.model.impl.MBMessageImpl at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:56) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:55) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:79) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:74) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:45) at com.thoughtworks.xstream.core.util.HierarchicalStreams.readClassType(HierarchicalStreams.java:29) at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:133) at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32) at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1058) at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1042) at com.thoughtworks.xstream.XStream.fromXML(XStream.java:913) at com.thoughtworks.xstream.XStream.fromXML(XStream.java:904) at com.liferay.portal.lar.PortletDataContextImpl.fromXML(PortletDataContextImpl.java:743) at com.liferay.portal.lar.PortletDataContextImpl.getZipEntryAsObject(PortletDataContextImpl.java:1363) at com.liferay.portal.kernel.lar.StagedModelDataHandlerUtil._getStagedModel(StagedModelDataHandlerUtil.java:309) at com.liferay.portal.kernel.lar.StagedModelDataHandlerUtil.importStagedModel(StagedModelDataHandlerUtil.java:287) at com.liferay.portal.kernel.lar.StagedModelDataHandlerUtil.importReferenceStagedModel(StagedModelDataHandlerUtil.java:207) at com.liferay.portal.kernel.lar.StagedModelDataHandlerUtil.importReferenceStagedModels(StagedModelDataHandlerUtil.java:277) at com.liferay.portal.kernel.lar.BaseStagedModelDataHandler.importComments(BaseStagedModelDataHandler.java:466) at com.liferay.portal.kernel.lar.BaseStagedModelDataHandler.importStagedModel(BaseStagedModelDataHandler.java:233) ... 64 more