probleme avec jsp

bon jour, je veux afficher une table mais il me indique une erreur.
voila ma page jsp.

---------index.jsp-------------------------------------------------
Code:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 <%@ page language="java" pageEncoding="ISO-8859-1"%> <%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean" %> <%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html" %> <%@ taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic" %> <%@ taglib uri="http://jakarta.apache.org/struts/tags-tiles" prefix="tiles" %> <%@ taglib uri="http://jakarta.apache.org/struts/tags-template" prefix="template" %> <%@ taglib uri="http://jakarta.apache.org/struts/tags-nested" prefix="nested" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html:html locale="true"> <head> <html:base /> <title>index.jsp</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page">  </head> <body>       <table border="1" width="396" height="118"> <tr> <th>ID</th> <th>DESIGNATION</th> <th>REFERENCE</th> </tr> <logic:iterate id="materiel" name="MATERIEL" property="MATERIEL" scope="requet" > <tr> <td><bean:write name="materiel" property="MATERIEL_ID"/></td> <td><bean:write name="materiel" property="DESIGN_MAT"/></td> <td><bean:write name="materiel" property="REFERENCE_MAT"/></td> </tr> </logic:iterate> </body> </html:html>
--------------------------------------------------------------------------et voila l'erreur
-------------------------------------------------------------------------

Citation:

Etat HTTP 500 -

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type Rapport d'exception

message

description Le serveur a rencontré une erreur interne () qui l'a empêché de satisfaire la requête.

exception

org.apache.jasper.JasperException: Exception in JSP: /index.jsp:41

38: <th>DESIGNATION</th>
39: <th>REFERENCE</th>
40: </tr>
41: <logic:iterate id="materiel" name="MATERIEL" property="MATERIEL" scope="requet" >
42:
43: <tr>
44: <td><bean:write name="materiel" property="MATERIEL_ID"/></td>

Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:467)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:371)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

cause mère

javax.servlet.ServletException: Invalid bean scope null
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:846)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:779)
org.apache.jsp.index_jsp._jspService(index_jsp.java:183)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

cause mère

javax.servlet.jsp.JspException: Invalid bean scope null
org.apache.struts.util.RequestUtils.getScope(RequestUtils.java:899)
org.apache.struts.util.RequestUtils.lookup(RequestUtils.java:878)
org.apache.struts.util.RequestUtils.lookup(RequestUtils.java:934)
org.apache.struts.taglib.logic.IterateTag.doStartTag(IterateTag.java:277)
org.apache.jsp.index_jsp._jspService(index_jsp.java:121)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

note La trace complète de la cause mère de cette erreur est disponible dans les fichiers journaux de Apache Tomcat/5.5.23.

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Apache Tomcat/5.5.23