RichFaces - FileUpload

Estou tentando fazer upload de vários arquivos utilizando o richfaces , porém está retornando este erro :

0/08/2010 11:50:19 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet Faces Servlet threw exception
java.lang.NullPointerException
	at javax.faces.webapp._ErrorPageWriter.writeVariables(_ErrorPageWriter.java:200)
	at javax.faces.webapp._ErrorPageWriter.writeVariables(_ErrorPageWriter.java:176)
	at javax.faces.webapp._ErrorPageWriter.debugHtml(_ErrorPageWriter.java:139)
	at javax.faces.webapp._ErrorPageWriter.handleException(_ErrorPageWriter.java:348)
	at javax.faces.webapp.FacesServlet.handleLifecycleException(FacesServlet.java:217)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:156)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
	at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
	at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:367)
	at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
	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:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Unknown Source)

O web.xml está configurado assim:


<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	id="WebApp_ID" version="2.5">

	<display-name>FTP</display-name>

	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>
	<servlet>
		<servlet-name>Faces Servlet</servlet-name>
		<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
		<init-param>
			<param-name>javax.faces.LIFECYCLE_ID</param-name>
			<param-value>DEFAULT</param-value>
		</init-param>
		<load-on-startup>30</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>Faces Servlet</servlet-name>
		<url-pattern>*.jsf</url-pattern>
	</servlet-mapping>

	<servlet-mapping>
		<servlet-name>Faces Servlet</servlet-name>
		<url-pattern>/faces/*</url-pattern>
	</servlet-mapping>

	<filter>
		<filter-name>MyFacesExtensionsFilter</filter-name>
		<filter-class>org.apache.myfaces.webapp.filter.ExtensionsFilter</filter-class>
		<init-param>
			<description>Set the size limit for uploaded files.
							Format: 10 - 10 
							bytes 10k - 
							10 KB 10m - 
							10 MB 
							1g - 
							1 GB
			</description>
			<param-name>maxFileSize</param-name>
			<param-value>20m</param-value>
		</init-param>
	</filter>


	<context-param>
		<param-name>org.richfaces.SKIN</param-name>
		<param-value>blueSky</param-value>
	</context-param>

	<context-param>
		<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
		<param-value>client</param-value>
	</context-param>

		<filter> 
		<display-name>Ajax4jsf Filter</display-name> 
		<filter-name>ajax4jsf</filter-name> 
		<filter-class>org.ajax4jsf.Filter</filter-class> 
			<init-param> 
				<param-name>createTempFiles</param-name> 
				<param-value>false</param-value> 
			</init-param> 
			<init-param> 
				<param-name>maxRequestSize</param-name> 
				<param-value>20000000</param-value> 
			</init-param> 
		</filter>

	<filter-mapping>
		<filter-name>ajax4jsf</filter-name>
		<servlet-name>Faces Servlet</servlet-name>
		<dispatcher>REQUEST</dispatcher>
		<dispatcher>FORWARD</dispatcher>
		<dispatcher>INCLUDE</dispatcher>		
	</filter-mapping>



</web-app>

Página:


<%@ taglib uri="http://richfaces.org/rich" prefix="rich"%>
<%@ taglib uri="http://myfaces.apache.org/tomahawk" prefix="t"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://richfaces.org/a4j" prefix="a4j"%>



<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<link rel="stylesheet" type="text/css" href="css/style.css">
<title>FTP</title>
</head>
<body>
<f:view>

	<h:form id="frmAnexo" enctype="multipart/form-data">

		<t:saveState value="ftpMB" />
		<center><rich:panel header="FTP"
			style=" width: 800px">
			<t:inputFileUpload id="fileupload" value="#{ftpMB.arquivo}">
			</t:inputFileUpload>

			</br>

			<rich:dataTable width="100%" value="#{ftpMB.listaArquivos}"
				id="gridArquivos" rows="7" var="dataArquivos">
				<f:facet name="header">
					<rich:columnGroup>
						<rich:column width="50%">
							<h:outputText styleClass="headerText" value="Arquivos" />
						</rich:column>
						<rich:column width="30%">
							<h:outputText styleClass="headerText" value="Download" />
						</rich:column>
					</rich:columnGroup>
				</f:facet>
				<rich:column width="40%">
					<h:outputText value="#{dataArquivos.nome}" />
				</rich:column>
				<rich:column width="30%">
					<h:outputLink title="Download" id="linkDownload"
						value="#{dataArquivos.link}">
						<h:graphicImage value="images/download.png" />

					</h:outputLink>
				</rich:column>
			</rich:dataTable>


		</rich:panel></center>

	</h:form>


</f:view>
</body>
</html>

OBS: Estou utilizando JSF 1.2 com o RichFaces 3.3.3 , MyFaces 1.2.2 e Tomahawk-1.1.9 , Se eu fizer para um arquivo funciona.

Valeu pela ajuda!