Duvida urgente <erro na funcao deletar>

Caro amigos.Peço a gentileza de uma ajuda urgente…O erro do programa é

HTTP Status 500 -

type Exception report

message

descriptionThe server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: #{ritosC.excluir}: java.lang.IllegalArgumentException
root cause

javax.faces.FacesException: #{ritosC.excluir}: java.lang.IllegalArgumentException
root cause

javax.faces.el.EvaluationException: java.lang.IllegalArgumentException
root cause

java.lang.IllegalArgumentException
note The full stack traces of the exception and its root causes are available in the Sun GlassFish Enterprise Server v2.1 logs.

O codigo fonte do projeto
Segue a pagina JSP.Ja vou falar que o erro acontece ao executar ritosC.excluir e nao sei porq o erro acontece

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>


<%@ taglib uri="http://richfaces.org/rich" prefix="rich"%>
<%@ taglib uri="http://richfaces.org/a4j" prefix="a4j"%>

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
    "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Ritos</title>
    </head>

    <body>
       


        <!Sem isto nao funciona o componente>
        <f:loadBundle basename="br.com.sistemajuridicowar.idiomas.language-pt" var="msg"/>

        <f:view>

        <h:form id="formRitosPages">
            <a4j:commandButton action="#{ritosC.novoRitos}"
                               value="#{msg.btnNovoRitos}"/>
            <br>
            <a4j:region>
            <rich:dataTable id = "tblRitos"
                            rows = "10"
                            columnClasses="col"
                            value="#{ritosC.todos}"
                            var='item'
                            border="1"
                            cellpadding="2"
                            cellspacing="0">

                <f:facet name="header">
                    <h:outputText value="#{msg.ritos}"/>
                </f:facet>

                <rich:column  sortBy="#{item.descricao}">
                    <f:facet name="header">
                        <h:outputText value="#{msg.descricao}" />
                    </f:facet>
                    <h:outputText value="#{item.descricao}" id="descricao" />
                </rich:column>

                <rich:column sortBy="#{item.flagAtivo}">
                    <f:facet name="header">
                        <h:outputText value="#{msg.flagAtivado}" />
                    </f:facet>
                    <h:outputText value="#{item.flagAtivo}" id="flagAtivo" />
                </rich:column>

                <rich:column>

                    <f:facet name="header">
                        <h:outputText value="#{acoes}" />
                    </f:facet>

                    <a4j:commandLink ajaxSingle="true"
                                     id="editarRegistro"
                                     action="#{ritosC.editar}">
                        <h:graphicImage value="/images/btn/btnEditar.gif"
                                        style="border:0"/>
                    </a4j:commandLink>

                    <rich:toolTip for="editarRegistro"
                                  value="#{msg.btnAlterar}"/>

                   <a4j:commandLink ajaxSingle="true"
                                    id="excluirRegistro"
                                    oncomplete="#{rich:component('deletePanel')}.show()">
                       <h:graphicImage value="/images/btn/btnExcluir.gif"
                                       style="border:0"/>
                   </a4j:commandLink>

                    <rich:toolTip for="excluirRegistro"
                                  value="#{msg.btnExcluir}"/>

                </rich:column>
                <f:facet name="footer">
                <rich:datascroller renderIfSinglePage="false"/>
                </f:facet>

            </rich:dataTable>
            </a4j:region>
        </h:form>




        <rich:modalPanel id="deletePanel" autosized="true" width="200">

            <f:facet name="header">
                <h:outputText value="#{msg.msgDeletar}"
                              style="padding-right:15px;" />
            </f:facet>
            <f:facet name="controls">
                <h:panelGroup>
                    <h:graphicImage value="/images/btn/close.png"
                        styleClass="hidelink" id="hidelink2" />
                    <rich:componentControl for="deletePanel" attachTo="hidelink2"
                                           operation="hide" event="onclick" />
                </h:panelGroup>
            </f:facet>

        <h:form>
            <table width="100%">
                <tbody>
                    <tr>
                        <td align="center" width="50%">
                <a4j:commandButton value="Yes" ajaxSingle="true"
                                   action="#{ritosC.excluir}"
                                   oncomplete="#{rich:component('deletePanel')}.hide();"
                                   reRender="table"
                                   />
                        </td>
                        <td align="center" width="50%">
                <a4j:commandButton value="Cancel"
                    onclick="#{rich:component('deletePanel')}.hide();return false;" />
                        </td>
                    </tr>
                </tbody>
            </table>
        </h:form>
        
        </rich:modalPanel>
        
        <a4j:status onstart="#{rich:component('wait')}.show()"
                    onstop="#{rich:component('wait')}.hide()"/>

        <rich:modalPanel id="wait" autosized="true" width="200" height="120" moveable="false" resizeable="false">
            <f:facet name="header">
                <h:outputText value="#{msg.msgProcessando}"/>
            </f:facet>
            <h:outputText value="#{msg.msgAguarde}"/>
        </rich:modalPanel>

        <rich:messages></rich:messages>


    </f:view>


</body>



</html>

Meu controller

package br.com.sistemajuridicowar.controller;

import br.com.sistemajuridico.sessionBean.RitosFacadeLocal;
import br.com.sistemajuridico.entity.Ritos;
import javax.ejb.EJB;
import javax.faces.model.DataModel;
import javax.faces.model.ListDataModel;

public class RitosController {

    @EJB
    private RitosFacadeLocal facade;
    private Ritos ritos;
    private DataModel model;

    public String novoRitos() {
        this.ritos = new Ritos();
        return "novoRitos";
    }

    public Ritos getRitos() {
        return ritos;
    }

    public void setRitos(Ritos ritos) {
        this.ritos = ritos;
    }

    public DataModel getTodos()
            throws Exception {

        model =
                new ListDataModel(facade.findAll());
        return model;

    }

    public Ritos getRitosFromEditOrDelete() {
        ritos =
                (Ritos) model.getRowData();
        return ritos;
    }

    public String editar() {
        ritos = getRitosFromEditOrDelete();
        setRitos(ritos);
        return "editarRitos";
    }

    public String excluir()
            throws Exception {
        ritos = getRitosFromEditOrDelete();
        facade.remove(ritos);
        return "sucessoRitos";

    }

    public String salvar()
            throws Exception {

        if (ritos.getIdRitos() == null) {
            facade.create(ritos);
        } else {
            facade.edit(ritos);
        }
        return "sucessoRitos";
    }

}

[/b]QUANDO EU FAÇO NORMALMENTE SEM USAR AJAX, TUDO FUNCIONA LEGAL, MAS TENTANDO USAR AJAX NAO TA DANDO CERTO.EU NAO SEI SE TEM A VER, MAS COMO VCS PODEM VER A FUNCAO EXCLUIR ESTA EXECUTANDO FORA DO ESCOPO HTML PRINCIPAL…BOM…AGUARDO RESPOSTA DE VCS[b]

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