CAF error while invoking another portlet

Hi All,
i have created the default.view, page.view portlets, in default.view portlet created the first name, last name labels of text input controls and command button (in property of action assign the page.view ), created web service connector of the flow service,which takes input document having first name,last name and depatment names, i have assign the binding expression of first name and last name to text input controls of default.view, in page.view created the department output/text input control and also async command button, assign the refresh action methods of webservice binding expression to the command/Assy command button control(action/action property) , assign the department name binding expression to the department text input, than i have deployed the application in mws and created the foleder in mws admin view and assign the this portlet.

login to mws with credentials, open the created portlet, after entering of the first name, last name values, i clicked on next button to navigate to page.view, given below error.

[POP.001.0002] A “javax.portlet.PortletException” occurred with the Message “at com.webmethods.caf.faces.portlet.FacesPortlet.render(FacesPortlet.java:378)”

java.lang.NullPointerException
at com.webmethods.caf.faces.component.nav.FirstLevelList.getValue(FirstLevelList.java:16)
at com.webmethods.caf.faces.component.table.html.DataTable.getContentProvider(DataTable.java:1670)
at com.webmethods.caf.faces.component.table.html.DataTable.isRowAvailable(DataTable.java:237)
at com.webmethods.caf.faces.component.table.html.DataTable.saveDescendantState(DataTable.java:1605)
at com.webmethods.caf.faces.component.table.html.DataTable.setRowIndex(DataTable.java:372)
at com.webmethods.caf.faces.render.html.BaseHtmlRenderer.registerClientSideComponents(BaseHtmlRenderer.java:147)
at com.webmethods.caf.faces.render.html.BaseHtmlRenderer.registerClientSideComponents(BaseHtmlRenderer.java:182)
at com.webmethods.caf.faces.render.html.BaseHtmlRenderer.registerClientSideComponents(BaseHtmlRenderer.java:182)
at com.webmethods.caf.faces.render.html.BaseHtmlRenderer.registerClientSideComponents(BaseHtmlRenderer.java:182)
at com.webmethods.caf.faces.render.html.BaseHtmlRenderer.writeSharedIncludes(BaseHtmlRenderer.java:104)
at com.webmethods.caf.faces.render.html.BaseHtmlRenderer.encodeBegin(BaseHtmlRenderer.java:60)
at com.webmethods.caf.faces.render.html.command.CommandFormRenderer.encodeBegin(CommandFormRenderer.java:66)
at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:802)
at com.webmethods.caf.faces.component.util.ComponentUtils.renderComponent(ComponentUtils.java:80)
at com.webmethods.caf.faces.component.util.ComponentUtils.renderComponent(ComponentUtils.java:88)
at com.webmethods.caf.faces.view.BaseViewHandler.renderResponse(BaseViewHandler.java:258)
at com.webmethods.caf.faces.view.BaseViewHandler.renderView(BaseViewHandler.java:124)
at com.webmethods.caf.faces.portlet.PortletLifecycle$RenderResponsePhase.execute(PortletLifecycle.java:694)
at com.webmethods.caf.faces.portlet.PortletLifecycle.phase(PortletLifecycle.java:250)
at com.webmethods.caf.faces.portlet.PortletLifecycle.render(PortletLifecycle.java:182)
at com.webmethods.caf.faces.portlet.FacesPortlet.render(FacesPortlet.java:336)
at com.webmethods.portal.framework.portletcontainer.impl.PortletApplicationHandler.process(PortletApplicationHandler.java:494)
at com.webmethods.portal.framework.portletcontainer.servlet.PortletServlet.service(PortletServlet.java:58)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.servlet.Dispatcher.include(Dispatcher.java:192)
at com.webmethods.portal.framework.portletcontainer.PortletContainer.dispatch(PortletContainer.java:220)
at com.webmethods.portal.framework.portletcontainer.PortletContainer.process(PortletContainer.java:129)
at com.webmethods.portal.framework.portletcontainer.PortletContainer.renderPortlet(PortletContainer.java:102)
at com.webmethods.portal.framework.portletcontainer.beans.PortletBean.processRequest(PortletBean.java:181)
at com.webmethods.portal.framework.portletcontainer.beans.PortletBean.getContentInternal(PortletBean.java:81)
at com.webmethods.portal.framework.portlet.beans.BasicPortletBean.getContent(BasicPortletBean.java:143)
at com.webmethods.portal.mech.portlet.impl.PortletMechanics.getPortletContent(PortletMechanics.java:95)
at com.webmethods.portal.mech.storage.page.PortletHelper.renderContent(PortletHelper.java:428)
at com.webmethods.portal.mech.storage.page.PortletHelper.renderContent(PortletHelper.java:400)
at com.webmethods.portal.framework.presentation.renderers.DefaultRenderer.renderPageContent(DefaultRenderer.java:278)
at com.webmethods.portal.framework.presentation.renderers.DefaultRenderer.render(DefaultRenderer.java:189)
at com.webmethods.portal.framework.presentation.PresentationManager.handlePres(PresentationManager.java:368)
at com.webmethods.portal.framework.dispatch.DispatchManager.pres(DispatchManager.java:622)
at com.webmethods.portal.framework.dispatch.DispatchManager.handle(DispatchManager.java:462)
at com.webmethods.portal.framework.dispatch.DispatchManager.handleDispatch(DispatchManager.java:372)
at com.webmethods.portal.framework.impl.PortalServlet.service(PortalServlet.java:245)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
at com.webmethods.portal.framework.impl.NTLMFilter.doFilter(NTLMFilter.java:50)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at com.webmethods.caf.faces.servlet.GZIPFilter.doFilter(GZIPFilter.java:42)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:828)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)

please any one help me to solve the problem.

regards,
anil kumar e