Class 'React\ZMQ\ConnContext'?

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;

$context = new React\ZMQ\Context($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'));

$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'?