Issue with Marionette and browserify

sample.js

// in bootstrap.js
var $ = require('jquery');
var Backbone = require('backbone');
Backbone.$ = $;

// in app.js
var Marionette = require('backbone.marionette');
var _ = require('underscore');

// in main.js
require('./bootstrap');
var App = require('./app');

Command in the terminal:

>browserify js/main.js -o js/bundled.js

Then when I open the page, I get that error: "cannot read property Deferred of undefined".

Thanks to @sllanes, it works for me now. Just changed the version I am using from 1.2.0 back to 1.1.2. Apparently backbone 1.2.0 has some issues working with marionette and browserify.