There is a wt.util.WTRuntimeException I couldn't solve it

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185: wt.util.WTRuntimeException: "wt.doc.WTDocument>9205053" 物件不是持續的。; 巢狀例外:

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           (wt.fc.fcResource/7) wt.fc.ObjectNoLongerExistsException: "wt.doc.WTDocument>9205053" 物件不是持續的。

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.vc.StandardVersionControlService.refresh(StandardVersionControlService.java:3015)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at sun.reflect.GeneratedMethodAccessor55.invoke(Unknown Source)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at java.lang.reflect.Method.invoke(Method.java:597)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.services.ServiceFactory$ServerInvocationHandler.invoke(ServiceFactory.java:314)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at $Proxy29.refresh(Unknown Source)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.fc.DefaultInflator$VfkCache.inflate(DefaultInflator.java:444)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.fc.DefaultInflator$VfkCache.inflate(DefaultInflator.java:436)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.fc.DefaultInflator$AbstractCache.get(DefaultInflator.java:291)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.fc.DefaultInflator$AbstractCache.get(DefaultInflator.java:259)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.fc.DefaultInflator.get(DefaultInflator.java:171)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.vc.VersionReference.getObject(VersionReference.java:123)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.workflow.engine.WfProcess.getName(WfProcess.java:1444)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.workflow.engine.WfContainerReference.initialize(WfContainerReference.java:102)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.workflow.engine.WfProcessReference.initialize(WfProcessReference.java:114)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.workflow.engine.WfProcessReference.newWfProcessReference(WfProcessReference.java:99)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at sun.reflect.GeneratedMethodAccessor59.invoke(Unknown Source)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at java.lang.reflect.Method.invoke(Method.java:597)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.fc.ReferenceResolver.getReference(ReferenceResolver.java:174)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.fc.collections.ReferenceUtility.createReference(ReferenceUtility.java:123)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.fc.collections.AbstractWTList.add(AbstractWTList.java:125)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.fc.collections.AbstractWTList.add(AbstractWTList.java:62)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.fc.collections.AbstractWTCollection.add(AbstractWTCollection.java:100)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.events.summary.SummaryEventFactory.finishTransaction(SummaryEventFactory.java:274)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.pom.TransactionManager.summaryEventFinishTransaction(TransactionManager.java:427)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.pom.TransactionManager.commitTransaction(TransactionManager.java:386)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.pom.BasicTransactionMonitor.commitTransaction(BasicTransactionMonitor.java:64)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.pom.PersistentObjectManager.commitTransaction(PersistentObjectManager.java:424)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.pom.Transaction.commit(Transaction.java:545)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at wt.queue.QueueRunnable.run(QueueRunnable.java:212)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

3/9/14 23:01:46: WfPropagationQueue.PoolQueueThread-3185:           at java.lang.Thread.run(Thread.java:662)

Resently, these messages show in MethodServer over and over again, it produce many and large logs file, I couldn't find any solution.

Could anyone tell how to solve it?