节点js，错误：找不到模块

Question

这是我运行nodejs app.js时得到的错误

module.js:340
throw err;
      ^
Error: Cannot find module 'share'
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/quicksilver/project/master/app.js:3:17)
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)

我反复收到此错误： 我已经多次完成npm install -g共享，但它没用。

var express = require('express')
var sharejs = require('share')
var connect = require('connect')
var AWS = require('aws-sdk');

//var zmq = require('zmq');
var app = express();
app.set('view options', {layout: false});
var problem={};
var sharejs_server;
AWS.config.loadFromPath('./awsconfig.json');

locomotive.boot('.', app.settings.env, function(err, app) {
var options = {};
if (err) { throw err; }
options.db = app.locals.db;
sharejs_server = sharejs.server.attach(app, options);
app.listen(app.locals.port, app.locals.ip, function () {
     var addr = this.address();
     console.log('listening on %s:%d', addr.address, addr.port);
}); 
});