problème jsf & tomcat

bonjour ,
je suis debutant en developpement web , j'ai commencer en suivant un tuto
bon j'utilise netbeans6.0 comme IDE et tomcat5.5 comme serveur d'application ;
mon problème c'est lorsque j'execute mon projet (faces-tutorial) la page qui s'affiche n'affiche pas le hello world mais un messgae disant que la resource /faces-tutorial/ n'est pas disponible
le contexte du mon application est :

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<?xml version="1.0" encoding="UTF-8"?>
<Context path="/faces-tutorial"/>

mon web.xml et le suivant :

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<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <context-param>
        <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
        <param-value>client</param-value>
    </context-param>
    <servlet>
        <servlet-name>FacesServlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
</web-app>

et mon faces-config est le suivant :

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE faces-config PUBLIC "-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.0//EN" "http://java.sun.com/dtd/web-facesconfig_1_0.dtd">
<faces-config>
    <application>
        <locale-config>
            <default-locale>fr</default-locale>
        </locale-config>
    </application>
</faces-config>

lorsque je consulte les logs du serveur je trouve :

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GRAVE: Erreur lors de la configuration de la classe d'écoute de l'application (application listener) com.sun.faces.config.ConfigureListener
java.lang.NoClassDefFoundError: javax/el/CompositeELResolver
        at java.lang.Class.getDeclaredConstructors0(Native Method)
        at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
        at java.lang.Class.getConstructor0(Unknown Source)
        at java.lang.Class.newInstance0(Unknown Source)
        at java.lang.Class.newInstance(Unknown Source)
        at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3678)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4187)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)
        at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:608)
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:493)
        at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1204)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.apache.commons.modeler.BaseModelMBean.invoke(BaseModelMBean.java:503)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(Unknown Source)
        at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(Unknown Source)
        at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1377)
        at org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:814)
        at org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:343)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        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.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:524)
        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:869)
        at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: javax.el.CompositeELResolver
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1352)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1198)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)

merci de m'indiquer ou se trouve le problème