The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

Estou tentando rodar uma aplicação JSF, com Tomcat 9, Eclipse Neon.3 mas ele está dando o seguinte erro: "The origin server did not find a current representation for the target resource or is not willing to disclose that one exists."

meu WEB.XML:

	<?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" 

	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

	  <display-name>Planos de Trabalhos Docente</display-name>

	  

	  <welcome-file-list>

	    <welcome-file>index.xhtml</welcome-file>

	  </welcome-file-list>

	  

	  <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>*.xhtml</url-pattern>

	  </servlet-mapping>

	  <filter>

	        <filter-name>Pretty Filter</filter-name>

	        <filter-class>com.ocpsoft.pretty.PrettyFilter</filter-class>

	  </filter>

	    <filter-mapping>

	        <filter-name>Pretty Filter</filter-name>

	        <url-pattern>/*</url-pattern>

	        <dispatcher>FORWARD</dispatcher>

	        <dispatcher>REQUEST</dispatcher>

	        <dispatcher>ERROR</dispatcher>

	    </filter-mapping>

	 

	</web-app>

	 

	Já fiz de tudo e nada de funcionar....