java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.apache.catalina.connector.Response.toAbsolute(Response.java:1485)
at org.apache.catalina.connector.Response.encodeURL(Response.java:1121)
at javax.servlet.http.HttpServletResponseWrapper.encodeURL(HttpServletResponseWrapper.java:76)
at javax.servlet.http.HttpServletResponseWrapper.encodeURL(HttpServletResponseWrapper.java:76)
at javax.servlet.http.HttpServletResponseWrapper.encodeURL(HttpServletResponseWrapper.java:76)
at javax.servlet.http.HttpServletResponseWrapper.encodeURL(HttpServletResponseWrapper.java:76)
at org.apache.jsp.WEB_002dINF.jsp.calendarNarrowView_jsp._jspx_meth_c_005furl_005f0(calendarNarrowView_jsp.java:443)
at org.apache.jsp.WEB_002dINF.jsp.calendarNarrowView_jsp._jspService(calendarNarrowView_jsp.java:184)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:535)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:472)
at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:227)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:257)
at org.springframework.web.servlet.ViewRendererServlet.renderView(ViewRendererServlet.java:111)
at org.springframework.web.servlet.ViewRendererServlet.processRequest(ViewRendererServlet.java:84)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:535)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:472)
at org.springframework.web.portlet.DispatcherPortlet.doRender(DispatcherPortlet.java:1140)
at org.springframework.web.portlet.DispatcherPortlet.render(DispatcherPortlet.java:1094)
at org.springframework.web.portlet.DispatcherPortlet.doRenderService(DispatcherPortlet.java:832)
at org.springframework.web.portlet.FrameworkPortlet.processRequest(FrameworkPortlet.java:483)
at javax.portlet.GenericPortlet.render(GenericPortlet.java:175)
at org.apache.pluto.core.PortletServlet.dispatch(PortletServlet.java:208)
at org.apache.pluto.core.PortletServlet.doGet(PortletServlet.java:139)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:535)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:472)
at org.apache.pluto.core.DefaultPortletInvokerService.invoke(DefaultPortletInvokerService.java:167)
at org.apache.pluto.core.DefaultPortletInvokerService.render(DefaultPortletInvokerService.java:101)
at org.apache.pluto.core.PortletContainerImpl.doRender(PortletContainerImpl.java:173)
at org.jasig.portal.channels.portlet.SpringPortletChannelImpl.render(SpringPortletChannelImpl.java:480)
at org.jasig.portal.channels.portlet.CSpringPortletAdaptor.renderCharacters(CSpringPortletAdaptor.java:186)
at org.jasig.portal.ChannelRenderer$Worker.execute(ChannelRenderer.java:545)
at org.jasig.portal.utils.threading.BaseTask.run(BaseTask.java:27)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)

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