VelocityViewServlet : Error processing the template

org.apache.velocity.exception.ResourceNotFoundException: Unable to find resource '/plan.html'
	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: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.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Thread.java:636)