a multi-threaded PDF conversion exception(Conversion service:WatchedFolder)

Hi,     

     I have a multi-threaded conversion exception(Conversion service:WatchedFolder)

     Some can be converted successfully, and some reported the following error

     Exception information is as follows

     ALC-PDG-16004-000: com.adobe.livecycle.generatepdf.client.ConversionException: ALC-PDG-016-004-An      error  was  encountered while processing the Microsoft Word file for PDF generation.
at com.adobe.pdfg.BMCCaller.checkResult(BMCCaller.java:377)
at com.adobe.pdfg.Native2PdfCaller.callNativeBMC(Native2PdfCaller.java:1 078)
at com.adobe.pdfg.Native2PdfCaller.createPDF(Native2PdfCaller.java:382)
at com.adobe.pdfg.GeneratePDFImpl.createPDFInternal(GeneratePDFImpl.java :501)
at com.adobe.pdfg.GeneratePDFImpl.createPDFCommon(GeneratePDFImpl.java:2 80)
at com.adobe.pdfg.GeneratePDFImpl.createPDF(GeneratePDFImpl.java:232)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. java:45)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:599)
at com.adobe.idp.dsc.component.impl.DefaultPOJOInvokerImpl.invoke(Defaul tPOJOInvokerImpl.java:118)
at com.adobe.idp.dsc.interceptor.impl.InvocationInterceptor.intercept(In vocationInterceptor.java:140)
at com.adobe.idp.dsc.interceptor.impl.RequestInterceptorChainImpl.procee d(RequestInterceptorChainImpl.java:60)
at com.adobe.idp.dsc.interceptor.impl.DocumentPassivationInterceptor.int ercept(DocumentPassivationInterceptor.java:53)
at com.adobe.idp.dsc.interceptor.impl.RequestInterceptorChainImpl.procee d(RequestInterceptorChainImpl.java:60)
at com.adobe.idp.dsc.transaction.interceptor.TransactionInterceptor$1.do InTransaction(TransactionInterceptor.java:74)
at com.adobe.idp.dsc.transaction.impl.ejb.adapter.EjbTransactionBMTAdapt erBean.doBMT(EjbTransactionBMTAdapterBean.java:197)
at com.adobe.idp.dsc.transaction.impl.ejb.adapter.EJSLocalStatelessEjbTr ansactionBMTAdapter_3af08fdf.doBMT(Unknown Source)
at com.adobe.idp.dsc.transaction.impl.ejb.EjbTransactionProvider.execute (EjbTransactionProvider.java:95)
at com.adobe.idp.dsc.transaction.interceptor.TransactionInterceptor.inte rcept(TransactionInterceptor.java:72)
at com.adobe.idp.dsc.interceptor.impl.RequestInterceptorChainImpl.procee d(RequestInterceptorChainImpl.java:60)
at com.adobe.idp.dsc.interceptor.impl.InvocationStrategyInterceptor.inte rcept(InvocationStrategyInterceptor.java:55)
at com.adobe.idp.dsc.interceptor.impl.RequestInterceptorChainImpl.procee d(RequestInterceptorChainImpl.java:60)
at com.adobe.idp.dsc.interceptor.impl.InvalidStateInterceptor.intercept( InvalidStateInterceptor.java:37)
at com.adobe.idp.dsc.interceptor.impl.RequestInterceptorChainImpl.procee d(RequestInterceptorChainImpl.java:60)
at com.adobe.idp.dsc.interceptor.impl.AuthorizationInterceptor.intercept (AuthorizationInterceptor.java:188)
at com.adobe.idp.dsc.interceptor.impl.RequestInterceptorChainImpl.procee d(RequestInterceptorChainImpl.java:60)
at com.adobe.idp.dsc.interceptor.impl.JMXInterceptor.intercept(JMXInterc eptor.java:48)
at com.adobe.idp.dsc.interceptor.impl.RequestInterceptorChainImpl.procee d(RequestInterceptorChainImpl.java:60)
at com.adobe.idp.dsc.engine.impl.ServiceEngineImpl.invoke(ServiceEngineI mpl.java:121)
at com.adobe.idp.dsc.routing.Router.routeRequest(Router.java:129)
at com.adobe.idp.dsc.provider.impl.base.AbstractMessageReceiver.routeMes sage(AbstractMessageReceiver.java:93)
at com.adobe.idp.dsc.provider.impl.vm.VMMessageDispatcher.doSend(VMMessa geDispatcher.java:225)
at com.adobe.idp.dsc.provider.impl.base.AbstractMessageDispatcher.send(A bstractMessageDispatcher.java:66)
at com.adobe.idp.dsc.clientsdk.ServiceClient.invoke(ServiceClient.java:2 08)
at com.adobe.idp.jobmanager.execution.workadapter.AbstractExecutableJob. invokeRequest(AbstractExecutableJob.java:127)
at com.adobe.idp.jobmanager.execution.workadapter.PersistentExecutableJo b.execute(PersistentExecutableJob.java:60)
at com.adobe.idp.dsc.workmanager.adapter.UnManagedAsynchronousWorkAdapte r.run(UnManagedAsynchronousWorkAdapter.java:39)
at com.adobe.idp.dsc.workmanager.adapter.websphere.J2WA_Work.run(J2WA_Wo rk.java:34)
at com.ibm.ws.asynchbeans.J2EEContext$RunProxy.run(J2EEContext.java:268)
at java.security.AccessController.doPrivileged(AccessController.java:202 )
at com.ibm.ws.asynchbeans.J2EEContext.run(J2EEContext.java:768)
at com.ibm.ws.asynchbeans.WorkWithExecutionContextImpl.go(WorkWithExecut ionContextImpl.java:222)
at com.ibm.ws.asynchbeans.ABWorkItemImpl.run(ABWorkItemImpl.java:159)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1527)