nodejs初学者：关于path.exists is now called `fs.exists`. undefined

场景：我的安装的node-v0.10.5-x64

var http=require(“http”), fs=require(“fs”), urlutil=require(“url”), path=require(“path”);

http.createServer(function(request, response){

var urlpath = urlutil.parse(request.url).pathname;

var absPath = __dirname + "/webroot" + urlpath;

path.exists(absPath, function(exists) {
    if(exists) {
     
        fs.readFile(absPath,function(err, data) {
      
        //if(err) throw err;
        console.log(data);
        response.write(data);
        response.end();
});
    } else {
        
        response.end('404 File not found.');
    }
});

}).listen(8888);

======================================================= 报错的信息：

path.exists is now called fs.exists. undefined

http.js:780 throw new TypeError(‘first argument must be a string or Buffer’); ^ TypeError: first argument must be a string or Buffer at ServerResponse.OutgoingMessage.write (http.js:780:11) at E:\鎶€鏈偍澶嘰node.js\鑱婂ぉ瀹index.js:21:22 at fs.js:237:16 at Object.oncomplete (fs.js:107:15)

有人说是版本的问题，但是我怎么换都还是报错！！！求高手解决！！！！