Erro ao rodar jsf dando erro java.lang.RuntimeException: Cannot find FacesContext

java.lang.RuntimeException: Cannot find FacesContext
	at javax.faces.webapp.UIComponentClassicTagBase.getFacesContext(UIComponentClassicTagBase.java:1841)
	at javax.faces.webapp.UIComponentClassicTagBase.setJspId(UIComponentClassicTagBase.java:1658)
	at org.apache.jsp.combo_jsp._jspx_meth_f_005fview_005f0(combo_jsp.java:97)
	at org.apache.jsp.combo_jsp._jspService(combo_jsp.java:72)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	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:191)
	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:286)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Unknown Source)

http://localhost:8080/TestaRichFaces/combo.jsp

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


<f:view>


	<h:form id="lista">

		<rich:comboBox selectFirstOnUpdate="false"
			defaultLabel="Enter some value">
			<f:selectItems value="#{pubUsuario.nivel}" />
		</rich:comboBox>

	</h:form>

</f:view>

<display-name>TestaRichFaces</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>
  
<display-name>Sample application</display-name>
	<context-param>
		<param-name>javax.faces.DEFAULT_SUFFIX</param-name>
		<param-value>.xhtml</param-value>
	</context-param>
	<context-param>
		<param-name>facelets.REFRESH_PERIOD</param-name>
		<param-value>2</param-value>
	</context-param>
	<context-param>
		<param-name>facelets.DEVELOPMENT</param-name>
		<param-value>true</param-value>
	</context-param>
	<context-param>
		<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
		<param-value>server</param-value>
	</context-param>
	<context-param>
		<param-name>org.richfaces.SKIN</param-name>
		<param-value>blueSky</param-value>
	</context-param>
	<filter>
		<display-name>Ajax4jsf Filter</display-name>
		<filter-name>ajax4jsf</filter-name>
		<filter-class>org.ajax4jsf.Filter</filter-class>
	</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>
	<servlet>
		<servlet-name>Faces Servlet</servlet-name>
		<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>Faces Servlet</servlet-name>
		<url-pattern>*.jsf</url-pattern>
	</servlet-mapping>
	<login-config>
		<auth-method>BASIC</auth-method>
	</login-config>
	
</web-app>

<application>
       <view-handler>com.sun.facelets.FaceletViewHandler</view-handler>
    </application>
	
	
	<managed-bean>
		<managed-bean-name>pubUsuario</managed-bean-name>
		<managed-bean-class>br.com.controller.PubUsuarioMB</managed-bean-class>
		<managed-bean-scope>session</managed-bean-scope>
	</managed-bean>

public class PubUsuarioMB {
/** carrega combo box com os Niveis */
	public SelectItem[] getNiveis() {
		Collection<PubNivel> niveis = null;
		try {
			niveis = DAOImpl.findNivelByNome();
		} catch (DataAccessException d) {
			status = "Problema na Pesquisa do Nivel " + d.getMessage();
			System.out.println("Erro Pesquisa Nivel = " + d);
		} catch (Exception e) {
			status = "Problema na Pesquisa do Nivel " + e.getMessage();
			System.out.println("Erro Pesquisa nivel = " + e);
		}

		List<SelectItem> itens = new ArrayList<SelectItem>(niveis.size());
		itens.add(new SelectItem(0L, "Escolher o Nível...."));
		for (PubNivel n : niveis) {
			itens.add(new SelectItem(n.getId(), n.getNomeNivel()));
		}// for end

		return itens.toArray(new SelectItem[itens.size()]);
	}