PHPSocket.io運行報錯

<?php
require_once __DIR__ . '/vendor/autoload.php';
use Workerman\Worker;
use PHPSocketIO\SocketIO;

// 创建socket.io服务端，监听3120端口
$io = new SocketIO(3120);
// 当有客户端连接时打印一行文字
$io->on('connection', function($socket)use($io){
  echo "new connection coming\n";
});

Worker::runAll();