Class 'React\ZMQ\Context' not found?

Question

[Space Around]

Файл(push-server.php) в котормо используется $context = new React\ZMQ\Context($loop); находиться на том же уровне, что и vendor
push-server.php

require 'vendor/autoload.php';
require 'Pusher.php';

$loop   = React\EventLoop\Factory::create();
$pusher = new MyApp\Pusher;

// Listen for the web server to make a ZeroMQ push after an ajax request
$context = new React\ZMQ\Context($loop);
$pull = $context->getSocket(ZMQ::SOCKET_PULL);
$pull->bind('tcp://127.0.0.1:5555'); // Binding to 127.0.0.1 means the only client that can connect is itself
$pull->on('message', array($pusher, 'onBlogEntry'));

// Set up our WebSocket server for clients wanting real-time updates
$webSock = new React\Socket\Server('0.0.0.0:8080', $loop); // Binding to 0.0.0.0 means remotes can connect
$webServer = new Ratchet\Server\IoServer(
    new Ratchet\Http\HttpServer(
        new Ratchet\WebSocket\WsServer(
            new Ratchet\Wamp\WampServer(
                $pusher
                )
                )
            ),
            $webSock
        );

        $loop->run();

Куда подевался Class 'React\ZMQ\Context'?