500 Servlet Exception

javax.servlet.jsp.JspException: jstl::15: expected top element at `java.lang.NullPointerException
	at com.lvsint.pricecache.producers.SportsListingProducer.toXML(SportsListingProducer.java:243)
	at com.lvsint.pricecache.producers.SportsListingProducer.produceListing(SportsListingProducer.java:233)
	at com.lvsint.cache.SportsListingCacheElement.load(SportsListingCacheElement.java:49)
	at com.lvsint.cache.LocalCache.createCacheElement(LocalCache.java:58)
	at com.lvsint.cache.CacheManager.getCacheElement(CacheManager.java:90)
	at com.vcint.tags.SportsListingTag.doEndTag(SportsListingTag.java:57)
	at _left_0nav_0vc__jsp._jspService(/export/apps/build/builds/cvsrepositorydriver/MavenBuildModule.2.2.28.Verify/release-2-2-28/MavenBuildModule/CheltenhamWeb/src/webapp/left_nav_vc.jsp:93)
	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.QRequestDispatcher.include(QRequestDispatcher.java:363)
	at com.caucho.server.http.QRequestDispatcher.include(QRequestDispatcher.java:274)
	at com.ca'(
	at org.apache.taglibs.standard.tag.common.xml.ParseSupport.doEndTag(ParseSupport.java:179)
	at _left_0nav_0vc__jsp._jspService(/export/apps/build/builds/cvsrepositorydriver/MavenBuildModule.2.2.28.Verify/release-2-2-28/MavenBuildModule/CheltenhamWeb/src/webapp/left_nav_vc.jsp:93)
	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.QRequestDispatcher.include(QRequestDispatcher.java:363)
	at com.caucho.server.http.QRequestDispatcher.include(QRequestDispatcher.java:274)
	at com.caucho.jsp.QPageContext.include(QPageContext.java:546)
	at _shell_0homepage__jsp._jspService(_shell_0homepage__jsp.java:1109)
	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.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 _click_0through__jsp._jspService(_click_0through__jsp.java:179)
	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.vcint.filters.VIPForwardingFilter.doFilter(VIPForwardingFilter.java:98)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at com.vcint.filters.SessionSecurityFilter.doFilter(SessionSecurityFilter.java:125)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at com.vcint.filters.LogMasterFilter.doFilter(LogMasterFilter.java:96)
	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.RunnerRequest.handleRequest(RunnerRequest.java:344)
	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:534)