XML Forms rendering

Hi,
I am storing some documents created from XML forms into a new repository created by us in KM. while opening this document from our repository, the content is opened in normal XML file format, instead of expected XML form renderer. But if I choose to edit this document, I am getting it opened in XML renderer. Any solutions to fix it ?
I added my repository to xmlforms_filter, in KM->CM->XMLFormsRepositoyFilter, but I got null pointer exception while editing and content not hyperlinked for directly opening.
Thanks in Advance,
John

I am attaching the stacktrace....
com.sapportals.wcm.repository.ResourceException: Exception while applying filters: null
     at com.sapportals.wcm.repository.ResourceException.fillInStackTrace(ResourceException.java:400)
     at java.lang.Throwable.(Throwable.java:195)
     at java.lang.Exception.(Exception.java:41)
     at com.sapportals.wcm.WcmException.(WcmException.java:59)
     at com.sapportals.wcm.util.content.ContentException.(ContentException.java:34)
     at com.sapportals.wcm.repository.ResourceException.(ResourceException.java:227)
     at com.sapportals.wcm.repository.runtime.CmFilterHandler.handleRuntimeException(CmFilterHandler.java:996)
     at com.sapportals.wcm.repository.runtime.CmFilterHandler.applyContentFilter(CmFilterHandler.java:546)
     at com.sapportals.wcm.repository.runtime.CmFilterHandler.applyContentReadFilter(CmFilterHandler.java:108)
     at com.sapportals.wcm.repository.ContentImpl.applyContentReadFilter(ContentImpl.java:389)
     at com.sapportals.wcm.repository.ContentImpl.initContent(ContentImpl.java:374)
     at com.sapportals.wcm.repository.ContentImpl.getContentType(ContentImpl.java:159)
     at com.sapportals.wcm.service.xmlforms.transformation.ResourceDemultiplexer.getContentStream(ResourceDemultiplexer.java:71)
     at com.sapportals.wcm.service.xmlforms.transformation.Transformation.render(Transformation.java:129)
     at com.sapportals.wcm.service.xmlforms.transformation.Transformation.renderItemOrTemplate(Transformation.java:274)
     at com.sapportals.wcm.app.xmlforms.EditServlet.doGetAction(EditServlet.java:342)
     at com.sapportals.wcm.app.xmlforms.XFBaseServlet.doGet(XFBaseServlet.java:246)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.sapportals.wcm.app.xmlforms.XFBaseServlet.service(XFBaseServlet.java:134)
     at com.sapportals.wcm.portal.proxy.PCProxyServlet.service(PCProxyServlet.java:334)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.sapportals.portal.prt.core.broker.ServletComponentItem$ServletWrapperComponent.doContent(ServletComponentItem.java:110)
     at com.sapportals.portal.prt.component.AbstractPortalComponent.serviceDeprecated(AbstractPortalComponent.java:209)
     at com.sapportals.portal.prt.component.AbstractPortalComponent.service(AbstractPortalComponent.java:114)
     at com.sapportals.portal.prt.core.PortalRequestManager.callPortalComponent(PortalRequestManager.java:328)
     at com.sapportals.portal.prt.core.PortalRequestManager.dispatchRequest(PortalRequestManager.java:136)
     at com.sapportals.portal.prt.core.PortalRequestManager.dispatchRequest(PortalRequestManager.java:189)
     at com.sapportals.portal.prt.component.PortalComponentResponse.include(PortalComponentResponse.java:215)
     at com.sapportals.portal.prt.pom.PortalNode.service(PortalNode.java:646)
     at com.sapportals.portal.prt.core.PortalRequestManager.callPortalComponent(PortalRequestManager.java:328)
     at com.sapportals.portal.prt.core.PortalRequestManager.dispatchRequest(PortalRequestManager.java:136)
     at com.sapportals.portal.prt.core.PortalRequestManager.dispatchRequest(PortalRequestManager.java:189)
     at com.sapportals.portal.prt.core.PortalRequestManager.runRequestCycle(PortalRequestManager.java:753)
     at com.sapportals.portal.prt.connection.ServletConnection.handleRequest(ServletConnection.java:240)
     at com.sapportals.portal.prt.dispatcher.Dispatcher$doService.run(Dispatcher.java:522)
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sapportals.portal.prt.dispatcher.Dispatcher.service(Dispatcher.java:405)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.sap.engine.services.servlets_jsp.server.servlet.InvokerServlet.service(InvokerServlet.java:156)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:390)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:264)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:347)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:325)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:887)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:241)
     at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
     at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:148)
     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(Native Method)
     at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:95)
     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:160)

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