VelocityServlet : Error processing the template org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getDiscussionMessage' in class org.sakaiproject.component.legacy.discussion.BaseDiscussionService$BaseDiscussionChannelEdit threw exception class org.sakaiproject.exception.IdUnusedException : nullorg.apache.velocity.exception.MethodInvocationException: Invocation of method 'getDiscussionMessage' in class org.sakaiproject.component.legacy.discussion.BaseDiscussionService$BaseDiscussionChannelEdit threw exception class org.sakaiproject.exception.IdUnusedException : null at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:309) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:207) at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:357) at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:135) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:94) at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:344) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:153) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:94) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:109) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:94) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:109) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:94) at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:344) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:153) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:94) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:109) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:271) at org.apache.velocity.Template.merge(Template.java:296) at org.apache.velocity.servlet.VelocityServlet.mergeTemplate(VelocityServlet.java:448) at org.apache.velocity.servlet.VelocityServlet.doRequest(VelocityServlet.java:387) at org.apache.velocity.servlet.VelocityServlet.doGet(VelocityServlet.java:333) at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:704) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:590) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:510) at org.sakaiproject.vm.VmServlet.includeVm(VmServlet.java:146) at org.sakaiproject.cheftool.VelocityPortletPaneledAction.toolModeDispatch(VelocityPortletPaneledAction.java:372) at org.sakaiproject.cheftool.ToolServlet.doGet(ToolServlet.java:158) at org.sakaiproject.cheftool.VelocityPortletPaneledAction.doGet(VelocityPortletPaneledAction.java:919) at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) at org.sakaiproject.vm.ComponentServlet.service(ComponentServlet.java:82) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:704) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:474) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:409) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312) at org.sakaiproject.tunnel.TunnelServlet.service(TunnelServlet.java:144) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157) at org.sakaiproject.util.servletfilter.SetupSakaiServicesFilter.doFilter(SetupSakaiServicesFilter.java:127) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705) at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683) at java.lang.Thread.run(Unknown Source)