500 Servlet Exception

javax.servlet.jsp.JspException: Missing resource 'null'
	at org.apache.taglibs.xsl.ApplyTag.getInputSource(ApplyTag.java:320)
	at org.apache.taglibs.xsl.ApplyTag.doEndTag(ApplyTag.java:258)
	at _transform__jsp._jspService(/llull/transform.jsp:11)
	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:362)
	at com.caucho.server.http.QRequestDispatcher.include(QRequestDispatcher.java:274)
	at com.caucho.jsp.QPageContext.include(QPageContext.java:547)
	at _estaticos._deu._programa._agendaobert__jsp._jspService(_agendaobert__jsp.java:100)
	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.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:595)