Error

VelocityViewServlet : Error processing the template

Unable to find resource '/course/lessons/00/references.vm'
org.apache.velocity.exception.ResourceNotFoundException: Unable to find resource '/course/lessons/00/references.vm'
	at org.apache.velocity.runtime.resource.ResourceManagerImpl.loadResource(ResourceManagerImpl.java:458)
	at org.apache.velocity.runtime.resource.ResourceManagerImpl.getResource(ResourceManagerImpl.java:341)
	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 org.apache.velocity.tools.view.servlet.VelocityViewServlet.getTemplate(Unknown Source)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.handleRequest(Unknown Source)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doRequest(Unknown Source)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doGet(Unknown Source)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:696)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:627)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:382)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:306)
	at org.apache.struts.chain.commands.servlet.PerformForward.handleAsForward(PerformForward.java:99)
	at org.apache.struts.chain.commands.servlet.PerformForward.perform(PerformForward.java:82)
	at org.apache.struts.chain.commands.AbstractPerformForward.execute(AbstractPerformForward.java:51)
	at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:48)
	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
	at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
	at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:280)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1858)
	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:446)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:696)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:198)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:595)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:432)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:954)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:138)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:595)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:432)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:954)
	at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2459)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:132)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:595)
	at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:593)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:593)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:432)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:954)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:126)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:595)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:432)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:954)
	at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	at java.lang.Thread.run(Thread.java:662)