Ember.js project - TypeError: session is undefined

I'm trying to run an Ember project that I had to upgrade it's packages, but now I run into deprecation issues.

My current issue is that when I press 'login' I see a TypeError: session is undefined message when I open the developer console in firefox.

I have no knowledge of Ember really, so to my very limited understanding is that there's a build javascript file that's based off an MCR architecture of little javascript files.

So here's the part of the big one:

define('genesis/controllers/login', ['exports', 'ember'], function (exports, _ember) {
  exports['default'] = _ember['default'].Controller.extend({
    loginMessage: "",
    actions: {
      authenticate: function authenticate() {
        var credentials = this.getProperties('identification', 'password'),
            authenticator = 'simple-auth-authenticator:jwt';
        this.set("loginMessage", "");
        var session = this.get('session');
        session.authenticate(authenticator, credentials);
      }
    }
  });
});

And this is the small one it's based off:

templates/login.js import Ember from 'ember';

export default Ember.Controller.extend({
  loginMessage: "",
  actions: {
    authenticate: function() {
      var credentials = this.getProperties('identification', 'password'),
        authenticator = 'simple-auth-authenticator:jwt';
      this.set("loginMessage", "");
      var session = this.get('session');
      session.authenticate(authenticator, credentials);
    }
  }
});

I had to change Ember.ObjectController.extend to Ember.Controller.extend due to deprecation.