ratchetをしようしてwebsocketサーバーを構築する時にエラーが出る

json
1コード
2{
3    "autoload": {
4        "psr-0": {
5            "MyApp": "src"
6        }
7    },
8    "require": {
9        "cboden/ratchet": "*"
10    }
11}

php
1
2コード
3
4<?php
5use Ratchet\Server\IoServer;
6use MyApp\Chat;
7
8    require dirname(__DIR__) . '/vendor/autoload.php';
9
10    $server = IoServer::factory(
11        new Chat(),
12        8080
13    );
14
15    $server->run();

php
1コード
2<?php
3namespace MyApp;
4use Ratchet\MessageComponentInterface;
5use Ratchet\ConnectionInterface;
6
7class Chat implements MessageComponentInterface {
8    protected $clients;
9
10    public function __construct() {
11        $this->clients = new \SplObjectStorage;
12    }
13
14    public function onOpen(ConnectionInterface $conn) {
15        // Store the new connection to send messages to later
16        $this->clients->attach($conn);
17
18        echo "New connection! ({$conn->resourceId})\n";
19    }
20
21    public function onMessage(ConnectionInterface $from, $msg) {
22        $numRecv = count($this->clients) - 1;
23        echo sprintf('Connection %d sending message "%s" to %d other connection%s' . "\n"
24            , $from->resourceId, $msg, $numRecv, $numRecv == 1 ? '' : 's');
25
26        foreach ($this->clients as $client) {
27            if ($from !== $client) {
28                // The sender is not the receiver, send to each client connected
29                $client->send($msg);
30            }
31        }
32    }
33
34    public function onClose(ConnectionInterface $conn) {
35        // The connection is closed, remove it, as we can no longer send it messages
36        $this->clients->detach($conn);
37
38        echo "Connection {$conn->resourceId} has disconnected\n";
39    }
40
41    public function onError(ConnectionInterface $conn, \Exception $e) {
42        echo "An error has occurred: {$e->getMessage()}\n";
43
44        $conn->close();
45    }
46}
47

上記のコードでwebsocketのさーばーを構築しようとしたのですが、エラーが出ます。

chat-server.phpでは
Warning: require(C:\xampp\htdocs\test/vendor/autoload.php): failed to open stream: No such file or directory in C:\xampp\htdocs\test\bin\chat-server.php on line 5

Fatal error: require(): Failed opening required 'C:\xampp\htdocs\test/vendor/autoload.php' (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\test\bin\chat-server.php on line 5

Chat.phpでは
Fatal error: Interface 'Ratchet\MessageComponentInterface' not found in C:\xampp\htdocs\test\src\MyApp\Chat.php on line 6

のように表示されます。
どのように改善すればよいですか？