How to load angular js (in a folder) with RequireJS correctly?

i am trying to load the angular js files in the folder Scripts\app with RequireJS, but receive the error. Need help.

Thanks

Here is the file structure:
Scripts
  | --app
      | --helper
             |--demo.js
      |--app.js

  |--angular.js


Here is my code:

BundleConfig.cs:
public class BundleConfig
{
      public static void RegisterBundles(BundleCollection bundles)
      {
            //......  jquery, css, etc.
            bundles.Add(new ScriptBundle("~/bundles/app").IncludeDirectory("~/Scripts/app", "*.js", true));
      }
}

main.js
require.config({
    shim: {
        jquery: {
            export: '$'
        },
....................
        angular: {
            exports: 'angular',
            deps: ["jquery"]
        },
        angularApp: {
            exports: 'angularApp',
            deps: ['angular']
        },

        global: { deps: ["jquery"] }

    },
    paths: {
        jquery: ['//ajax.aspnetcdn.com/ajax/jQuery/jquery-2.1.0',
          // fallback to local jQuery
          //'libs/jquery'
          'jquery-2.1.0.min'
        ],
        angular: 'angular',

        // Add a random query string to the URL to ensure we always get the latest.
        // I have tried to use '/bundles/app' also, it does not work
        'angularApp': '/bundles/app?',

    }
});
// Require Global dependencies
require(['jquery', 'jquery.validate', 'jqueryui', 'global',
    'datatables', 'jquery.tableTools',
    'bootstrap',
    'angularApp'
], function ($, jqvalidate, jqueryui, global) {
    angular.module('orbit').init();      
});

_Layout,cshtml:
        <script data-main="@Url.Content("~/Scripts/main")" src="@Url.Content("~/Scripts/libs/require.js")"></script>

        <script type="text/javascript">
            /*  This script block is for cache-busting. It forces JavaScript files loaded by Require JS to
                be for the current version of the site -- thus forcing a server refresh every time a
                deployment is done (i.e., when the version number is updated). */
            require.config({
                urlArgs: "v=@(MyApp.Web.Framework.SiteDiagnostics.WebAppVersion)"
            });
        </script>

I received the error:
Failed to load resource: the server responded with a status of 404 (Not Found):
https://localhost:44300/bundles/app?&v=1.0.2.25578 

Uncaught Error: Script error for: angularApp:
require.js:141