Erro ao usar reRender no rich:menuItem

Montei um menu dinamico que é baseado nas tabelas do meu banco, mas ao usar o action ele deveria preencher o divCorpo,
mas dá o seguinte erro:

Target component for id divCorpo not found

Não sei o que faço. Help-me…

Código da página

<?xml version="1.0" encoding="UTF-8"?>
<!--
To change this template, choose Tools | Templates
and open the template in the editor.
-->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      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:c="http://java.sun.com/jstl/core"
      xmlns:a4j="http://richfaces.org/a4j"
      xmlns:rich="http://richfaces.org/rich">
    <ui:composition template="../layout/template.xhtml">
        <ui:define name="menu">
            <h:form>
                <rich:toolBar>
                    <c:forEach items="#{LoginBean.userVO.modules}" var="module">
                        <rich:dropDownMenu>
                            <f:facet name="label">
                                <h:panelGroup>
                                    <h:graphicImage value="/images/icons/copy.gif" styleClass="pic"/>
                                    <h:outputText value="${module.name}"/>
                                </h:panelGroup>
                            </f:facet>

                            <!-- Sub Menu -->
                            <c:forEach items="${module.subModuleVO}" var="menu">
                                <rich:menuItem submitMode="ajax"
                                               value="${menu.action}"
                                               reRender="divCorpo"
                                               action="#{navigation.open}"
                                               icon="layout/images/icons/${menu.icon}">
                                    <a4j:actionparam name="url" value="${menu.action}"/>
                                </rich:menuItem>
                            </c:forEach>
                        </rich:dropDownMenu>
                    </c:forEach>
                </rich:toolBar>
            </h:form>
        </ui:define>


        <ui:define name="profile">
            <!-- Dados do usuário -->
            <div id="destaque" class="destaque">
                <br><h:graphicImage url="layout/images/icons/user.png"/> &nbsp; Usuário: #{LoginBean.userVO.email}</br>
                <br>Nível: #{LoginBean.userVO.perfil.descricao}</br>
                <br>
                    <h:outputLink action="#{LoginBean.logoff}">
                        Sair do sistema &nbsp;
                    </h:outputLink>
                    <!--
                    &nbsp; &nbsp; &nbsp;<h:graphicImage url="layout/images/icons/door_out.png"/>
                    -->
                </br>
            </div>
        </ui:define>
        
        <!-- Corpo -->
        <a4j:form>
            <f:view>
                <ui:define name="body">
                    <div id="divCorpo">
                        <a4j:include viewId="#{navigation.url}"></a4j:include>
                    </div>
                </ui:define>
            </f:view>
        </a4j:form>
    </ui:composition>
</html>

Classe Bean para navegação.

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package org.cvhnet.util;

import javax.faces.context.FacesContext;

/**
 *
 * @author rmoraes
 */
public class Navigation {

    private String url = "/pages/index.xhtml";

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String open() {
        String url = (String) FacesContext.getCurrentInstance().getExternalContext().getSessionMap().get("url");
        setUrl(url);
        return "";
    }
}

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