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java.lang.NullPointerException: 	at weblogicx.xml.tags.XsltTag.doEndTag(XsltTag.java:207)	at jsp_servlet._portlets._xmltest.__content._jspService(content.jsp:7)	at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)	at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:945)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:332)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:376)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:242)	at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:539)	at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:368)	at weblogic.servlet.jsp.PageContextImpl.include(PageContextImpl.java:119)	at jsp_servlet._framework.__portlet._jspService(portlet.jsp:84)	at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)	at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:945)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:332)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:242)	at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:539)	at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:368)	at weblogic.servlet.jsp.PageContextImpl.include(PageContextImpl.java:119)	at com.bea.portal.render.servlets.jsp.taglib.RenderTag.renderPortlets(RenderTag.java:172)	at com.bea.portal.render.servlets.jsp.taglib.RenderTag.doStartTag(RenderTag.java:60)	at jsp_servlet._framework._layouts._spanningthreecolumn.__template._jspService(template.jsp:10)	at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)	at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:945)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:332)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:376)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:242)	at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:539)	at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:368)	at weblogic.servlet.jsp.PageContextImpl.include(PageContextImpl.java:119)	at jsp_servlet._framework.__page._jspService(page.jsp:64)	at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)	at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:945)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:332)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:242)	at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:539)	at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:368)	at weblogic.servlet.jsp.PageContextImpl.include(PageContextImpl.java:119)	at jsp_servlet._framework.__portal._jspService(portal.jsp:19)	at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)	at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:945)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:332)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:242)	at weblogic.servlet.internal.RequestDispatcherImpl$ForwardAction.run(RequestDispatcherImpl.java:341)	at weblogic.security.service.SecurityServiceManager.runAs(SecurityServiceManager.java:721)	at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:251)	at com.bea.portal.appflow.servlets.internal.PortalWebflowServlet.doGet(PortalWebflowServlet.java:146)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:945)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:332)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:242)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:5360)	at weblogic.security.service.SecurityServiceManager.runAs(SecurityServiceManager.java:721)	at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3043)	at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2468)	at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:152)	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:133)