这是我要运行的代码

//global.$ = $;

var abar = require('address_bar');
var folder_view = require('folder_view');
var path = require('path');
var shell = require('nw.gui').Shell;

这就是我得到的：

module.js：340抛出错误; ^

错误：找不到模块“ nw.gui”

at Function.Module._resolveFilename (module.js:338:15)

at Function.Module._load (module.js:280:25)

at Module.require (module.js:364:17)

at require (module.js:380:17)

at Object.<anonymous> (/home/parisa/Documents/nw-sample-apps-

master/file-explorer/main.js:6:13)

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 Function.Module.runMain (module.js:497:10) Program exited.

我无法获得此模块。我该怎么办？