2.10 'duplicate route error'

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
//  this.route('error');
});

export default Router;

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
	model() {
  	return new Ember.RSVP.Promise((res,rej) => {
      rej({test:'test'});
//    	setTimeout(() => {
//    		res({ name: 'David' });
 //     }, 3000);
    });
  }
});

templates.application-error.hbs

<h2>Error state</h2>
Info sent back: {{model.test}}

templates.application-loading.hbs

<h1>loading</h1>

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.0",
    "ember-data": "2.10.0",
    "ember-template-compiler": "2.10.0",
    "ember-testing": "2.10.0"
  },
  "addons": {}
}