An Error Occurred:

javax.faces.FacesException: javax.faces.el.EvaluationException: Cannot get value for expression '#{!empty webRequest.rootCategories}'
	at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:432)
	at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:255)
	at eu.ndtech.cms.common.CMSViewHandler.renderView(CMSViewHandler.java:55)
	at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:41)
	at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:146)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:147)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:374)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:462)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:388)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:316)
	at org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:213)
	at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:171)
	at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
	at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
	at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:394)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:366)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:639)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:881)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1647)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.jasper.JasperException: javax.faces.el.EvaluationException: Cannot get value for expression '#{!empty webRequest.rootCategories}'
	at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:582)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:498)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:383)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:331)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:462)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:388)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:316)
	at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:426)
	... 40 more
Caused by: javax.faces.el.EvaluationException: Cannot get value for expression '#{!empty webRequest.rootCategories}'
	at org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:405)
	at javax.faces.component.UIComponentBase.isRendered(UIComponentBase.java:1417)
	at org.apache.myfaces.custom.htmlTag.AbstractHtmlTag.isRendered(AbstractHtmlTag.java:76)
	at javax.faces.webapp.UIComponentTag.isSuppressed(UIComponentTag.java:1090)
	at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:473)
	at org.apache.jsp.modules.forum.index_jsp._jspx_meth_t_005fhtmlTag_005f0(index_jsp.java:680)
	at org.apache.jsp.modules.forum.index_jsp._jspx_meth_t_005fdocument_005f0(index_jsp.java:396)
	at org.apache.jsp.modules.forum.index_jsp._jspx_meth_f_005fview_005f0(index_jsp.java:282)
	at org.apache.jsp.modules.forum.index_jsp._jspService(index_jsp.java:239)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:465)
	... 53 more
Caused by: javax.faces.el.EvaluationException: Exception getting value of property rootCategories of base of type : eu.ndtech.cms.web.WebRequest
	at org.apache.myfaces.el.PropertyResolverImpl.getValue(PropertyResolverImpl.java:99)
	at org.apache.myfaces.el.ELParserHelper$MyPropertySuffix.evaluate(ELParserHelper.java:539)
	at org.apache.commons.el.ComplexValue.evaluate(ComplexValue.java:145)
	at org.apache.commons.el.UnaryOperatorExpression.evaluate(UnaryOperatorExpression.java:156)
	at org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:386)
	... 64 more
Caused by: javax.faces.el.EvaluationException: Bean: eu.ndtech.cms.web.WebRequest, property: rootCategories
	at org.apache.myfaces.el.PropertyResolverImpl.getProperty(PropertyResolverImpl.java:463)
	at org.apache.myfaces.el.PropertyResolverImpl.getValue(PropertyResolverImpl.java:85)
	... 68 more
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.GeneratedMethodAccessor145535.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.myfaces.el.PropertyResolverImpl.getProperty(PropertyResolverImpl.java:459)
	... 69 more
Caused by: java.lang.NullPointerException