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java.lang.NullPointerException: 	at org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:831)	at org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:813)	at org.apache.velocity.app.VelocityEngine.getTemplate(VelocityEngine.java:470)	at net.sf.navigator.displayer.VelocityMenuDisplayer.displayComponents(VelocityMenuDisplayer.java:105)	at net.sf.navigator.displayer.VelocityMenuDisplayer.display(VelocityMenuDisplayer.java:87)	at net.sf.navigator.taglib.DisplayMenuTag.doStartTag(DisplayMenuTag.java:100)	at net.sf.navigator.taglib.el.DisplayMenuTag.doStartTag(DisplayMenuTag.java:45)	at org.apache.jsp.common.decorator.mainLayout_jsp._jspx_meth_menu_displayMenu_0(mainLayout_jsp.java:293)	at org.apache.jsp.common.decorator.mainLayout_jsp._jspx_meth_menu_useMenuDisplayer_0(mainLayout_jsp.java:259)	at org.apache.jsp.common.decorator.mainLayout_jsp._jspService(mainLayout_jsp.java:124)	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:332)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)	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 com.opensymphony.module.sitemesh.filter.PageFilter.writeDecorator(PageFilter.java:173)	at com.opensymphony.module.sitemesh.filter.PageFilter.applyDecorator(PageFilter.java:158)	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:62)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:264)	at org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:107)	at org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:72)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:274)	at org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:110)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:274)	at org.acegisecurity.wrapper.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:81)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:274)	at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:216)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:274)	at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:195)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:274)	at org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:148)	at org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:90)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:199)	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:282)	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:754)	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:684)	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:876)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)	at java.lang.Thread.run(Thread.java:595)