Errors with socket.io?

我最近实现了socket.io并遇到了一些奇怪的错误。

我收到的错误消息并没有太大的帮助，并试图找出导致这种情况的原因。

以下是我app.js的内容 -

应用.js

// Express Requirements
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var multer = require('multer');
// Formidable Requirements
var formidable = require('formidable');
var util = require('util');
var routes = require('./routes/index');
var app = require('express')();
var server = require('http').Server(app);
var io = require('socket.io')(server);
server.listen(8888);
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'hjs');
// Non Default Code
// Socket.io Code
io.on('connection', function (client) {
  console.log("Client connected!");
  client.emit('newcommer',{status: true, newuser: 'paul'});
});
// End Socket.io Code
// End Non Default Code
// uncomment after placing your favicon in /public
//app.use(favicon(__dirname + '/public/favicon.ico'));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', routes);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
});
// error handlers
// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
    app.use(function(err, req, res, next) {
        res.status(err.status || 500);
        res.render('error', {
            message: err.message,
            error: err
        });
    });
}
// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
        message: err.message,
        error: {}
    });
});
module.exports = app;

错误信息

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: listen EADDRINUSE
    at errnoException (net.js:904:11)
    at Server._listen2 (net.js:1042:14)
    at listen (net.js:1064:10)
    at Server.listen (net.js:1138:5)
    at Object.<anonymous> (/Users/blah/blah/app.js:20:8)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)
28 Nov 19:10:39 - [nodemon] app crashed - waiting for file changes before starting...

有没有人看到可能导致此错误的任何关闭？

对罪魁祸首的编辑：

删除这些行后，代码不会产生任何错误：

var server = require('http').Server(app);
var io = require('socket.io')(server);
// Socket.io Code
io.on('connection', function (client) {
  console.log("Client connected!");
  client.emit('newcommer',{status: true, newuser: 'paul'});
});
// End Socket.io Code