VelocityViewServlet : Error processing the template

Unable to find resource '/index.dorelated-sites.vm'
org.apache.velocity.exception.ResourceNotFoundException: Unable to find resource '/index.dorelated-sites.vm'
	at org.apache.velocity.runtime.resource.ResourceManagerImpl.loadResource(ResourceManagerImpl.java:501)
	at org.apache.velocity.runtime.resource.ResourceManagerImpl.getResource(ResourceManagerImpl.java:384)
	at org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:814)
	at org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:796)
	at org.apache.velocity.runtime.RuntimeSingleton.getTemplate(RuntimeSingleton.java:337)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.getTemplate(VelocityViewServlet.java:562)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.handleRequest(VelocityViewServlet.java:489)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doRequest(VelocityViewServlet.java:425)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doGet(VelocityViewServlet.java:392)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:824)
	at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:330)
	at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:830)
	at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:224)
	at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:133)
	at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
	at java.lang.Thread.run(Thread.java:534)