net.fortuna.ical4j.data.ParserException: Error at line 22: null

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net.fortuna.ical4j.data.ParserException: Error at line 22: null
at net.fortuna.ical4j.data.CalendarParserImpl.parse(CalendarParserImpl.java:135)
at net.fortuna.ical4j.data.CalendarBuilder.build(CalendarBuilder.java:176)
at net.fortuna.ical4j.data.CalendarBuilder.build(CalendarBuilder.java:157)
at net.fortuna.ical4j.data.CalendarBuilder.build(CalendarBuilder.java:145)
at org.jasig.portlet.calendar.processor.ICalendarContentProcessorImpl.getEvents(ICalendarContentProcessorImpl.java:72)
at org.jasig.portlet.calendar.adapter.ConfigurableHttpCalendarAdapter.getEvents(ConfigurableHttpCalendarAdapter.java:161)
at org.jasig.portlet.calendar.mvc.controller.AjaxCalendarController.getEventList(AjaxCalendarController.java:169)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:421)
at org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:271)
at org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerAdapter.doHandle(AnnotationMethodHandlerAdapter.java:259)
at org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerAdapter.handleAction(AnnotationMethodHandlerAdapter.java:210)
at org.springframework.web.portlet.DispatcherPortlet.doActionService(DispatcherPortlet.java:694)
at org.springframework.web.portlet.FrameworkPortlet.processRequest(FrameworkPortlet.java:480)
at org.apache.pluto.core.PortletServlet.dispatch(PortletServlet.java:218)
at org.apache.pluto.core.PortletServlet.doPost(PortletServlet.java:145)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
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:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
at org.apache.pluto.core.DefaultPortletInvokerService.invoke(DefaultPortletInvokerService.java:167)
at org.apache.pluto.core.DefaultPortletInvokerService.action(DefaultPortletInvokerService.java:85)
at org.apache.pluto.core.PortletContainerImpl.doAction(PortletContainerImpl.java:217)
at org.jasig.portal.portlet.rendering.PortletRendererImpl.doAction(PortletRendererImpl.java:184)
at org.jasig.portal.channels.portlet.SpringPortletChannelImpl.action(SpringPortletChannelImpl.java:260)
at org.jasig.portal.channels.portlet.CSpringPortletAdaptor.processAction(CSpringPortletAdaptor.java:155)
at org.jasig.portal.ChannelRenderer$Worker.execute(ChannelRenderer.java:524)
at org.jasig.portal.utils.threading.BaseTask.run(BaseTask.java:41)
at sun.reflect.GeneratedMethodAccessor207.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.jasig.portal.$Proxy145.run(Unknown Source)
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$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

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