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java.lang.NullPointerException: 	at org.apache.pluto.invoker.impl.PortletInvokerImpl.invoke(PortletInvokerImpl.java:109)	at org.apache.pluto.invoker.impl.PortletInvokerImpl.load(PortletInvokerImpl.java:80)	at org.apache.pluto.PortletContainerImpl.portletLoad(PortletContainerImpl.java:218)	at org.apache.pluto.portalImpl.core.PortletContainerWrapperImpl.portletLoad(PortletContainerWrapperImpl.java:94)	at org.apache.pluto.portalImpl.aggregation.PortletFragment.service(PortletFragment.java:120)	at org.apache.jsp.WEB_002dINF.aggregation.ColumnFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.ColumnFragment_jsp:65)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)	at org.apache.pluto.portalImpl.aggregation.AbstractFragment.service(AbstractFragment.java:112)	at org.apache.jsp.WEB_002dINF.aggregation.RowFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.RowFragment_jsp:65)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)