500 Servlet Exception

javax.servlet.jsp.JspException: ServletException in '/WEB-INF/jsp/common/noMenuLayout.jsp':
ServletException in '/WEB-INF/jsp/common/generalLayout.jsp': Define tag
cannot set a null value for bean with id: list3
	at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:923)
	at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:462)
	at _jsp._ayuda._requerimientostecnicos_0es__jsp._jspService(ayuda/RequerimientosTecnicos_ES.jsp:475)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
	at com.caucho.jsp.Page.pageservice(Page.java:570)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:179)
	at com.farolatino.util.lang.filters.UTF8EncodingFilter.doFilter(UTF8EncodingFilter.java:40)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:70)
	at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:173)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
	at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:274)
	at com.caucho.server.port.TcpConnection.run(TcpConnection.java:511)
	at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:516)
	at com.caucho.util.ThreadPool.run(ThreadPool.java:442)
	at java.lang.Thread.run(Thread.java:595)