VelocityServlet: Error processing the template

java.lang.NullPointerException
	at com.opensymphony.webwork.views.velocity.WebWorkVelocityServlet.mergeTemplate(WebWorkVelocityServlet.java:96)
	at org.apache.velocity.servlet.VelocityServlet.doRequest(VelocityServlet.java:372)
	at org.apache.velocity.servlet.VelocityServlet.doGet(VelocityServlet.java:317)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:681)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1449)
	at com.opensymphony.webwork.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:163)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1420)
	at com.opensymphony.webwork.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:43)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1420)
	at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1420)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:447)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:138)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:540)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:213)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1084)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:376)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:175)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1018)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:136)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:227)
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
	at org.eclipse.jetty.server.Server.handle(Server.java:451)
	at org.eclipse.jetty.server.HttpChannel.run(HttpChannel.java:252)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:266)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.run(AbstractConnection.java:240)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:596)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:527)
	at java.lang.Thread.run(Thread.java:748)