Erreur tuto n°2 création d'un site web de A à Z

**mon erreur que j'ai sa me dit
Fatal error: Class 'Disptacher' not found in D:\xampp\htdocs\webroot\index.php on line 10 :( je donne index dispatcher includes & request :

<?php

define('WEBROOT' ,dirname( __FILE__ ));

define('ROOT',dirname(WEBROOT));

define('DS',DIRECTORY_SEPARATOR);

define('CORE',ROOT.DS.'core');

define('BASE_URL',dirname(dirname($_SERVER'SCRIPT_NAME'])));

require CORE.DS.'includes.php';

new Disptacher();

?>

<?php
class Dispatcher{
    var $request;
    function __construct(){
    $this->request = new Request();
    }

}
?>

<?php
require 'Request.php';
require 'Dispatcher.php';
?>

<?php
class Request{
    function __construct(){
    }

}
?>

**