Application web avec JBoss Seam

je suis un étudiant en informatique je prépare mon projet fin d'étude, j'utilise le jboss-seam-2.0.1.GA (jsf,richefaces) pour développer une application web, après exécution, je suis obtient l'erreur suivant:

Code:

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Error Parsing /demande.xhtml: Error Traced[line: 3] The markup in the document preceding the root element must be well-formed.
 
com.sun.facelets.FaceletException: Error Parsing /demande.xhtml: Error Traced[line: 3] The markup in the document preceding the root element must be well-formed.
    at com.sun.facelets.compiler.SAXCompiler.doCompile(SAXCompiler.java:234)
    at com.sun.facelets.compiler.Compiler.compile(Compiler.java:105)
    at com.sun.facelets.impl.DefaultFaceletFactory.createFacelet(DefaultFaceletFactory.java:197)
    at com.sun.facelets.impl.DefaultFaceletFactory.getFacelet(DefaultFaceletFactory.java:144)
    at com.sun.facelets.impl.DefaultFaceletFactory.getFacelet(DefaultFaceletFactory.java:95)
    at com.sun.facelets.FaceletViewHandler.buildView(FaceletViewHandler.java:517)
    at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:567)
    at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108)
    at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:216)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
    at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
    at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
    at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
    at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
    at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
    at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:141)
    at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:281)
    at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
    at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
    at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
    at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
    at java.lang.Thread.run(Thread.java:595)

le le code de l'interface

Code:

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<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
                      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ page language="java" pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
 
 
<%@ taglib uri="http://richfaces.org/rich" prefix="rich" %>
<%@ taglib uri="http://richfaces.org/a4j" prefix="a4j" %>
 
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
                xmlns:s="http://jboss.com/products/seam/taglib"
                xmlns:ui="http://java.sun.com/jsf/facelets"
                xmlns:f="http://java.sun.com/jsf/core"
                xmlns:h="http://java.sun.com/jsf/html"
                xmlns:rich="http://richfaces.org/rich"
                template="layout/template.xhtml">
<ui:define name="body">
 
    <h:graphicImage value="BILINGUE_couleur.jpg"></h:graphicImage>
        <meta http-equiv="pragma" content="no-cache"></meta>
        <meta http-equiv="cache-control" content="no-cache"></meta>
        <meta http-equiv="expires" content="0"></meta>    
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"></meta>
        <meta http-equiv="description" content="This is my page"></meta>
        <!--
        <link rel="stylesheet" type="text/css" href="styles.css">
        -->
 
    <body background="Fond2.jpg">
    <f:view>
            <a4j:form>
                <a href="authentification.xhtml"><u>Déconnexion</u></a>
                <rich:panel header="SSISAM 2010">
                    <a href="authentification.xhtml"><u>ACCUEIL</u></a>
 
                    <rich:toolBar id="toolbar"  itemSeparator="disc">
 
 
                    <rich:dropDownMenu value="Affaire">
 
                    <rich:menuGroup value="Demande">
                    <rich:menuItem ajaxSingle="true" reRender="status,simulationTabOutputPanel">
                    <a4j:commandLink><h:outputText value="Nouvelle demande"/>
                    </a4j:commandLink>
                    </rich:menuItem>
                    </rich:menuGroup>
 
                    </rich:menuGroup>
                    </rich:dropDownMenu>
                    <rich:dropDownMenu value="Facturation">
                    <rich:menuGroup value="Facture" rendered="false">
                    <rich:menuItem value="editer facture" >
                    </rich:menuItem>
 
                    </rich:menuGroup>
                    </rich:dropDownMenu>
                    </rich:toolBar>
 
                </rich:panel>
 
 
 
            </a4j:form>
    </f:view>
    </body>    
</ui:define> 
</ui:composition>

AIDEZ MOI SVP CE TRES URGENT, ET MERCI