节点js上的视频流错误

Question

我正在尝试使用socket.io在node.js中构建一个简单的视频流网站，但是，我似乎遇到了很多问题。

    module.js:471
    throw err;
    ^

Error: Cannot find module 'log'
    at Function.Module._resolveFilename (module.js:469:15)
    at Function.Module._load (module.js:417:25)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (C:\Users\Jon2713\Desktop\sockets_folder\wcam-live\index.js:26:11)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)

我不确定问题是什么，我已经研究了几个小时并且没有找到解决方案。这是我的代码

Index.js

    var express = require("express");
var app = new express();
var http = require("http").Server(app);
var io = require("socket.io")(http);

var Log = require('log'),
    log = new Log('debug')

var port = process.env.PORT || 3000;

app.use(express.static(__dirname + "/public" ));

app.get('/', function(req, res){

        res.redirect('index.html');
        });
app.listen(port,function(){
           log.info('Listening on port %s',port);
           });

的package.json

{

    "name" : "Wcam Live",
    "version" : "0.0.1",
    "dependencies" : {
        "socket.io": "*",
        "express" : "*",
        "log" : "*"
    }


}