Greetings,
i tried to use tiles and tld files on a jsp page,but i encounter an error
while trying to load the jsp file.

These are the libraries i insert into the WEB-INF/lib folder
struts.jar, struts-tiles.tld, struts-nested.tld, struts-logic.tld,
struts-html.tld, struts-bean.tld, struts-el.jar, struts-bean.tld, jstl.jar,
c.tld, c-rt.tld

My jsp which i'm using:
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html"%>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean"%>
<%@ taglib uri="/WEB-INF/struts-tiles.tld" prefix="tiles"%>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core"%><head>
<!-- Enter css here -->

<script language="JavaScript">history.go(1)</script>

</head>


<html:html locale="true">
<table width=100%  border="0" cellpadding="0" cellspacing="0"
style="margin-top:0px;margin-bottom:0px"><tr><td>
<tiles:insert attribute="header" />
<tiles:insert attribute="body" />
<tiles:insert attribute="footer" />
</td></tr></table>

</html:html>

The errors i encounter:

21:06:05,876 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
        at
org.apache.struts.taglib.tiles.InsertTag.processAttribute(InsertTag.java:687)
        at
org.apache.struts.taglib.tiles.InsertTag.createTagHandler(InsertTag.java:478)
        at
org.apache.struts.taglib.tiles.InsertTag.doStartTag(InsertTag.java:438)
        at
org.apache.jsp.DefaultLayout_jsp._jspx_meth_tiles_insert_0(org.apache.jsp.DefaultLayout_jsp:139)
        at
org.apache.jsp.DefaultLayout_jsp._jspx_meth_html_html_0(org.apache.jsp.DefaultLayout_jsp:106)
        at
org.apache.jsp.DefaultLayout_jsp._jspService(org.apache.jsp.DefaultLayout_jsp:69)
        at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
        at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
        at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
        at
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
        at
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
        at
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
        at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
        at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
        at java.lang.Thread.run(Thread.java:595)

I will like to ask what have i miss or what do i need to configure to solve
this error?

Thanks


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