如何将我自己的类添加到ratchat服务器

我使用棘轮创建websocket服务器，但我有一个问题....
如何编写自己的类并将它们使用到这个....

PHP:

    <?php
    namespace MyApp;
    use Ratchet'MessageComponentInterface;
    use Ratchet'ConnectionInterface;
    define ("ABSPATH" , "D:/MyProject/server/bin/");
    require_once ABSPATH."config.php";
    require_once ABSPATH."classes/clients.php";// <--- i required this file that
//it contain clients class 
//but when i want to use it i get error that this class notfound
    class Poker implements MessageComponentInterface {
        protected $clients;
        public function __construct(){   
            $this->clients = array();
        }
        public function onOpen(ConnectionInterface $conn) {
            $client = new clients($conn);//here i get error
            array_push($this->clients,$client);
        }
        public function onMessage(ConnectionInterface $from, $msg) {
    }
        public function onClose(ConnectionInterface $conn) {
        }
        public function onError(ConnectionInterface $conn, 'Exception $e) {
        }
    }

我需要类文件

require_once ABSPATH."classes'clients.php";

但是在这一行我得到了error

$client = new clients($conn);// ERROR CLASS NOT FOUND

ERROR:

Fatal error: Class 'MyApp'clients' not found in D:'MyProject'server'src'MyAp
p'Poker.php on line 18