使用logic:iterate遇到的问题

<logic:iterate id="agUser" name="agUserOverview">
        <tr>
        <td align="left" class="page"
        <a href="processuser.do?actiontype=view&aguserid=<bean:write name="agUser" property="userid" filter="true" />">
            <bean:write name="agUser" property="userid" filter="true" /></a>
          </td>
             <td align="center" class="page"><bean:write name="agUser" property="username" filter="true" /></td>
             <td align="center" class="page"><bean:write name="agUser" property="password" filter="true" /></td>
             <td align="center" class="page">
             <logic:equal name="agUser" property="roleid" value="1">
             管理员
             </logic:equal>
             <logic:equal name="agUser" property="roleid" value="2">
             普通员工
             </logic:equal>
             </td>
          </tr>
</logic:iterate>
如果把红色那段去掉，程序就能运行，也能把数据表现出来， 但是如果留下这段，页面就会出错误：

HTTP Status 500 -

type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception javax.servlet.ServletException: Cannot find message resources under key org.apache.struts.action.MESSAGE
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:867)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:800)
org.apache.jsp.system.user.queryuserresult_jsp._jspService(queryuserresult_jsp.java:175)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1056)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:388)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:231)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397)
javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

root cause javax.servlet.jsp.JspException: Cannot find message resources under key org.apache.struts.action.MESSAGE
org.apache.struts.taglib.TagUtils.retrieveMessageResources(TagUtils.java:1233)
org.apache.struts.taglib.TagUtils.message(TagUtils.java:1082)
org.apache.struts.taglib.TagUtils.message(TagUtils.java:1057)
org.apache.struts.taglib.bean.WriteTag.retrieveFormatString(WriteTag.java:256)
org.apache.struts.taglib.bean.WriteTag.formatValue(WriteTag.java:319)
org.apache.struts.taglib.bean.WriteTag.doStartTag(WriteTag.java:234)
org.apache.jsp.system.user.queryuserresult_jsp._jspx_meth_bean_write_0(queryuserresult_jsp.java:206)
org.apache.jsp.system.user.queryuserresult_jsp._jspService(queryuserresult_jsp.java:125)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1056)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:388)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:231)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397)
javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

note The full stack trace of the root cause is available in the Tomcat logs.

Apache Tomcat/5.0.19