500 internal server Error ,when i clicking the REVIEW/SAVE button in pcr

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Hi

Iam facing the problem with pcr forms in portal .Forms are displaying in portal. when i click the button Review and save .It is showing 500 internal server error.But sometimes it is working fine upto completed step.There is irregularity in display.

Iam not understanding why this is happening like this.So let me know the solution for it.To display properly.

Here iam sending tracefile to.

Webresource could not be exchanged!

EXCEPTION

com.sap.tc.webdynpro.services.sal.util.cache.ResourceNotFoundException: Stream is not valid

at com.sap.tc.webdynpro.services.sal.util.cache.ResourcePool$CopyByFirstReadResourcePoolElement.setInputStream(ResourcePool.java:475)

at com.sap.tc.webdynpro.serverimpl.defaultimpl.datatransport.MassDataSource.setInputStream(MassDataSource.java:106)

at com.sap.tc.webdynpro.services.sal.datatransport.core.InternalMassDataTransport.replaceInputMassDatasourceByKey(InternalMassDataTransport.java:96)

at com.sap.tc.webdynpro.clientserver.cal.WebDynproExchangeHandler.replaceCachedResource(WebDynproExchangeHandler.java:217)

at com.sap.tc.webdynpro.clientserver.cal.WebDynproExchangeHandler.doExchange(WebDynproExchangeHandler.java:181)

at com.sap.tc.webdynpro.clientserver.session.ClientSession.doExchangeProcessing(ClientSession.java:1166)

at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingStandalone(ClientSession.java:763)

at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:712)

at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:261)

at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:149)

at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:62)

at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doPost(DispatcherServlet.java:53)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:365)

at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:944)

at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:266)

at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)

at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:174)

at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)

at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)

at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)

at java.security.AccessController.doPrivileged(AccessController.java:207)

at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)

at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)

Caused by: com.sap.engine.services.httpserver.exceptions.HttpIOException: Read timeout. The client has disconnected or a synchronization error has occurred. Read 4380 bytes. Expected 14205.

at com.sap.engine.services.httpserver.server.io.HttpInputStream.read(HttpInputStream.java:186)

at java.io.InputStream.read(InputStream.java:109)

at com.sap.tc.webdynpro.basesrvc.util.IOUtil.writeEncrypted(IOUtil.java:154)

at com.sap.tc.webdynpro.services.sal.util.cache.ResourcePool$AbstractResourceElement.copyUnique(ResourcePool.java:245)

at com.sap.tc.webdynpro.services.sal.util.cache.ResourcePool$CopyByFirstReadResourcePoolElement.save(ResourcePool.java:537)

at com.sap.tc.webdynpro.services.sal.util.cache.ResourcePool$CopyByFirstReadResourcePoolElement.setInputStream(ResourcePool.java:471)