[RESOLVIDO] Erro ao solicitar uma página usando o método "action" do jsf

Olá
Eu estou frequentando um curso de java web, e estou tentando através do método action ir de página a página só que dá o seguinte erro. Será que estou a fazer algo de errado? Fiz exactamente como foi feito na video aula.

HTTP Status 500 - Error Parsing /menu.xhtml: Error Traced[line: 2] The processing instruction target matching "[xX][mM][lL]" is not allowed.


type Exception report

message Error Parsing /menu.xhtml: Error Traced[line: 2] The processing instruction target matching "[xX][mM][lL]" is not allowed.

description The server encountered an internal error that prevented it from fulfilling this request.

exception 
javax.servlet.ServletException: Error Parsing /menu.xhtml: Error Traced[line: 2] The processing instruction target matching "[xX][mM][lL]" is not allowed.
	javax.faces.webapp.FacesServlet.service(Unknown Source)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)



root cause 
javax.faces.view.facelets.FaceletException: Error Parsing /menu.xhtml: Error Traced[line: 2] The processing instruction target matching "[xX][mM][lL]" is not allowed.
	com.sun.faces.facelets.compiler.SAXCompiler.doCompile(Unknown Source)
	com.sun.faces.facelets.compiler.SAXCompiler.doCompile(Unknown Source)
	com.sun.faces.facelets.compiler.Compiler.compile(Unknown Source)
	com.sun.faces.facelets.impl.DefaultFaceletFactory.createFacelet(Unknown Source)
	com.sun.faces.facelets.impl.DefaultFaceletFactory.access$100(Unknown Source)
	com.sun.faces.facelets.impl.DefaultFaceletFactory$1.newInstance(Unknown Source)
	com.sun.faces.facelets.impl.DefaultFaceletFactory$1.newInstance(Unknown Source)
	com.sun.faces.facelets.impl.DefaultFaceletCache$1.newInstance(Unknown Source)
	com.sun.faces.facelets.impl.DefaultFaceletCache$1.newInstance(Unknown Source)
	com.sun.faces.util.ExpiringConcurrentCache$1.call(Unknown Source)
	java.util.concurrent.FutureTask.run(Unknown Source)
	com.sun.faces.util.ExpiringConcurrentCache.get(Unknown Source)
	com.sun.faces.facelets.impl.DefaultFaceletCache.getFacelet(Unknown Source)
	com.sun.faces.facelets.impl.DefaultFaceletCache.getFacelet(Unknown Source)
	com.sun.faces.facelets.impl.DefaultFaceletFactory.getFacelet(Unknown Source)
	com.sun.faces.facelets.impl.DefaultFaceletFactory.getFacelet(Unknown Source)
	com.sun.faces.application.view.FaceletViewHandlingStrategy.buildView(Unknown Source)
	com.sun.faces.lifecycle.RenderResponsePhase.execute(Unknown Source)
	com.sun.faces.lifecycle.Phase.doPhase(Unknown Source)
	com.sun.faces.lifecycle.LifecycleImpl.render(Unknown Source)
	javax.faces.webapp.FacesServlet.service(Unknown Source)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)



note The full stack trace of the root cause is available in the Apache Tomcat/7.0.88 logs.


Apache Tomcat/7.0.88

Meu código:

<?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://java.sun.com/jsf/html"
	xmlns:f="http://java.sun.com/jsf/core">

<h:head>
	<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
	<title>Navegacao</title>
</h:head>
<h:body>
	<h:form>

		<h:panelGrid columns="2">
			<h:outputLabel value="Usuario" />
			<h:inputText maxlength="10" size="15" />

			<h:outputLabel value="Senha" />
			<h:inputSecret maxlength="6" size="15" />
		</h:panelGrid>

		<h:panelGrid columns="2">
			<h:commandButton value="Entrar" action="menu" />
			<h:commandButton value="Recuperar senha" />
		</h:panelGrid>
	</h:form>


</h:body>
</html>

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