Ember-cli require("my_app/app")["default"].create is not a function

I'm migrating my project from a situation where it was a nested asset in a Rails app to separate frontend with Ember-Cli. And I've been stuck with the following problem for quite some time now:

When running $ Ember serve in my terminal and opening localhost:4200 with Chrome I get the following error in the console: Uncaught TypeError: undefined is not a function in app-boot.js:25

On that line the following code is present:

require("my_app/app")["default"].create({
  "defaultLocale":"en",
  "name":"my_app",
  "version":"0.0.0.bece32c1"
});

I added a breakpoint on that line and checked if require("my_app/app" was defined, and it was Object {default: Class} so I checked if the default object property was defined, and this also was the case:

Class {modulePrefix: "my_app", podModulePrefix: undefined,
       Resolver: function, _readinessDeferrals: 1, $: function…}

The console output of require("my_app/app")["default"] can be seen in the following screenshot:

This is the content of my config/environment file:

And this is the content of my app/index.html file:

And this is the content of my app/app.js file:

I'm using the latest version of Ember-cli, Ember v1.10.0, ember-data v1.0.0-beta.15 and Jquery 1.11.2

I hope someone knows a solution for this problem or can point me in the right direction. If you need more information don't hesitate to ask!

Thanks in advance,

Alexander Jeurissen