Jsf + richfaces + message (não mostra)

Boa Tarde, Pessoal!

Estou fazendo um mini cadastro e preciso validar se os 2 campos foram preenchidos.
Coloquei o requerid = true e o h:message, porém a mensagem de validação não aparece e no console mostra a seguinte mensagem:
"ERROR [HtmlResponseStateManager] No component states to be saved in client response!"

Segue o código.

<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<!-- RichFaces tag library declaration -->
<%@ taglib uri="http://richfaces.org/a4j" prefix="a4j"%>
<%@ taglib uri="http://richfaces.org/rich" prefix="rich"%>
 
<html>
      <head>
            <title>Disparador E-mail Private</title>
      </head>
      <body style="background-color: #f0efea; margin-top: 25px;"> 
          
         <style type="text/css">
          .btn {
          	width:80px;
          	height:25px;
          	font-size: 11px; 
           	font-family: arial,sans-serif; 
           	font-weight:bold;
           	cursor:  pointer;
           	text-align: center; 
           	
           	border-top-width: 0px;
           	border-right-width: 0px;
           	border-bottom-width: 0px;
           	border-left-width: 0px; 
          } 
          
          .inputText {
          	width:300px;
          	height:20px;
          	font-size: 11px; 
           	font-family: arial,sans-serif;           	
           	text-align: left; 
           	
           	border-top-width: 0px;
           	border-right-width: 0px;
           	border-bottom-width: 0px;
           	border-left-width: 0px; 
           	           	
           	border-top-color:#E6E8FA;
            border-right-color:#E6E8FA;
            border-bottom-color:#E6E8FA;
            border-left-color:#E6E8FA;
            background-color: #E6E8FA;
          } 
          
          .outputText {          
          	font-size: 11px; 
           	font-family: arial,sans-serif; 
           	font-weight:bold;       
          } 
          
           .rich-painel {
            border-top-color:#dfa5a5;
            border-right-color:#dfa5a5;
            border-bottom-color:#dfa5a5;
            border-left-color:#dfa5a5;
            background-color: rgb(248, 236, 236);
           }
           
           .rich-painel-header {
            border-top-color:#dfa5a5;
            border-right-color:#dfa5a5;
            border-bottom-color:#dfa5a5;
            border-left-color:#dfa5a5;
            background-color: rgb(248, 236, 236);
           }  
           
           .col1 { width: 40px; }
 	       .col2 { width: 150px; }
 	       .col3 { width: 150px; }
 	    
         }
          
         </style>
              
         <f:view>
         <h:form>
              
           <rich:panel header="Cadastro de Remetentes - Incluir" style="width: 625px"  >
           <h:messages errorStyle="color:red" infoStyle="color:#5ac67e"  />
           <h:panelGrid columns="3" columnClasses="col1, col2, col3">
  
           	 <h:outputText value="Nome:" styleClass="outputText"/>    
           	 <h:inputText id="nome" value=" " styleClass="inputText" required="true" />
             <h:message for="nome"/>
                         	 
           	 <h:outputText value="Email:" styleClass="outputText"/>   
           	 <h:inputText id="email" value=" " styleClass="inputText" required="true" /> 
           	 <h:message for="email" /> 
           	            	 
           </h:panelGrid>
           	  	   
        	 <h:panelGrid columns="2">
        	 	<h:commandButton value="Salvar" styleClass="btn" />
           	 	<h:commandButton value="Cancelar" styleClass="btn" /> 
        	 </h:panelGrid>
        
           </rich:panel>
         </h:form>  
            
         </f:view>          
      </body>
</html>

Agradeço desde já pela ajuda!

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