Remover item da tabela | Java e JSF 2 - II: Componentes ricos com Primefaces

Estou tentando excluir um item da tabela. eu abro um p:Dialog e la tem um botão que deleto, mas quando tento deletar apresenta erro dizendo que a entidade esta null.

ago 27, 2017 10:52:13 PM com.sun.faces.lifecycle.ApplyRequestValuesPhase execute
ADVERTÊNCIA: #{pessoaBean.Remove}: java.lang.IllegalArgumentException: attempt to create delete event with null entity
javax.faces.FacesException: #{pessoaBean.Remove}: java.lang.IllegalArgumentException: attempt to create delete event with null entity

Trecho do Bean

public String Remove() {
        this.objRb.Remove(this.pessoa);

        return "";
    }


Pagina


<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://xmlns.jcp.org/jsf/html"
    xmlns:f="http://xmlns.jcp.org/jsf/core"
    xmlns:p="http://primefaces.org/ui">


    <h:head>
        <title>Título da página (seção head necessária ao Primefaces)</title>
    </h:head>


<h:body>


<p:layout fullPage="true">

   <p:layoutUnit position="north" size="100">
                teste
   </p:layoutUnit>

    <p:layoutUnit position="west" resizable="false" size="245" >
     <h:form >
        <p:menu  />

    <h3>Toggleable</h3>
    <p:menu toggleable="true">
        <p:submenu label="Ajax">
            <p:menuitem value="Save" icon="ui-icon-disk" />
            <p:menuitem value="Update"  icon="ui-icon-arrowrefresh-1-w"/>
        </p:submenu>
        <p:submenu label="Non-Ajax">
            <p:menuitem value="Delete"   ajax="false" icon="ui-icon-close"/>
        </p:submenu>
        <p:submenu label="Navigations">
            <p:menuitem value="External" url="http://www.primefaces.org" icon="ui-icon-home"/>

        </p:submenu>
    </p:menu>
    </h:form  >
    </p:layoutUnit>

    <p:layoutUnit position="center">
        <h:form id="teste">
         <p:growl id="msgs" showDetail="true" />
        <legend>Dados Pessoa</legend>
        <h:panelGrid>

            <h:outputLabel value = "Nome:" for="Nome" />
            <h:inputText id="Nome" value = "#{pessoaBean.pessoa.nome}"/>
            <h:outputLabel value = "Mae:" for="Mae" />
            <h:inputText id="Mae"/>
            <h:outputLabel value = "Pai:" for="Pai" />
            <h:inputText id="Pai"/>
            <p:commandButton value="Salvar" action="#{pessoaBean.gravar}" update="@form" process="@form" />
        </h:panelGrid>








    <h:panelGrid columns="3">
                <p:inputText value="#{pessoaBean.filtro.descricao}" id="descricao"/>

                <p:commandButton value="Consultar" update="tablePessoa" process="@form" />
    </h:panelGrid>

    <p:dataTable id="tablePessoa" var="pessoa" value="#{pessoaBean.model}" rows="5" lazy="true"
                         paginator="true"
                         paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
                         rowsPerPageTemplate="5,10,15" currentPageReportTemplate="Página: {currentPage} de {totalPages} " >
        <p:column headerText="nome">
            <h:outputText value="#{pessoa.nome}" />
        </p:column>
       <p:column style="width:32px;text-align: center">
             <p:commandButton update="form:carDetail" oncomplete="PF('carDialog').show()" icon="ui-icon-search" title="View" >
                <f:setPropertyActionListener value="#{pessoa}" target="#{pessoaBean.pessoa}" />
            </p:commandButton>
        </p:column>

    </p:dataTable>



</h:form>

    </p:layoutUnit>
</p:layout>

<h:form id="form">

  <p:dialog header="Car Info" widgetVar="carDialog" modal="true" showEffect="fade" hideEffect="fade" resizable="false">
        <p:outputPanel id="carDetail" style="text-align:center;">
            <p:panelGrid  columns="2" rendered="#{not empty pessoaBean.pessoa}" columnClasses="value">
                <f:facet name="header">

                </f:facet>

                <h:outputText value="Nome:" />
                <h:outputText value="#{pessoaBean.pessoa.nome}" />


            </p:panelGrid>
        </p:outputPanel>
      <p:growl id="growl" life="2000" />

     <h:commandLink action="#{pessoaBean.Remove}" immediate="true"> 
           <h:outputText value="Delete" />                    
          <f:setPropertyActionListener value="#{pessoa}" target="#{pessoaBean.pessoa}" />
          <p:ajax update="teste:tablePessoa"/> 
     </h:commandLink>




    </p:dialog>






    </h:form>
</h:body>

</html>