500 Servlet Exception

java.lang.NullPointerException
	at com.yw.ads.DFPAdExpert.getDFPAdSlotSecondLevel(DFPAdExpert.java:235)
	at _WEB_22dINF._jsp._ads._gpt_22dads_22djs__jsp._jspService(/WEB-INF/jsp/ads/gpt-ads-js.jsp:35)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
	at com.caucho.jsp.Page.subservice(Page.java:506)
	at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182)
	at com.caucho.server.http.Invocation.service(Invocation.java:315)
	at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
	at com.caucho.server.http.QRequestDispatcher.include(QRequestDispatcher.java:364)
	at com.caucho.server.http.QRequestDispatcher.include(QRequestDispatcher.java:275)
	at com.caucho.jsp.QPageContext.include(QPageContext.java:550)
	at _WEB_22dINF._jsp._templates._yachtworldTemplate__jsp._jspService(_yachtworldTemplate__jsp.java:646)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
	at com.caucho.jsp.Page.subservice(Page.java:506)
	at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182)
	at com.caucho.server.http.Invocation.service(Invocation.java:315)
	at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
	at com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.java:222)
	at com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.java:103)
	at com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.java:80)
	at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:142)
	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:243)
	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1141)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:878)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:792)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:461)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:416)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:126)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:103)
	at com.caucho.server.http.FilterChainServlet.doFilter(FilterChainServlet.java:96)
	at com.caucho.server.http.Invocation.service(Invocation.java:315)
	at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
	at com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.java:222)
	at com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.java:103)
	at com.caucho.server.http.QRequestDispatcher.forward(QRequestDispatcher.java:80)
	at com.yw.filters.RewriteFilter.doFilter(RewriteFilter.java:240)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at com.yw.web.filter.XSSFilter.doFilter(XSSFilter.java:38)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:130)
	at org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:98)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at com.yw.acegi.filter.ServerNameFilterToBeanProxy.doFilter(ServerNameFilterToBeanProxy.java:58)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at com.yw.acegi.filter.ServerNameFilterToBeanProxy.doFilter(ServerNameFilterToBeanProxy.java:58)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at com.yw.crm.filter.TrackContactFilter.doFilter(TrackContactFilter.java:71)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at com.yw.filters.UserIdFilter.doFilter(UserIdFilter.java:116)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at com.yw.filters.MiniSitesFilter.doFilter(MiniSitesFilter.java:52)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at com.yw.localization.filter.LocaleParamFilter.doFilter(LocaleParamFilter.java:67)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at com.yw.util.metrics.filter.StartTimeFilter.doFilter(StartTimeFilter.java:46)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at com.yw.web.filter.RootDirFilter.doFilter(RootDirFilter.java:135)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:63)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at com.caucho.server.http.Invocation.service(Invocation.java:315)
	at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
	at com.caucho.server.http.RunnerRequest.handleRequest(RunnerRequest.java:346)
	at com.caucho.server.http.RunnerRequest.handleConnection(RunnerRequest.java:274)
	at com.caucho.server.TcpConnection.run(TcpConnection.java:139)
	at java.lang.Thread.run(Thread.java:595)

Resin 2.1.13 (built Thu Apr 1 10:57:42 PST 2004)