Caught 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('my-route');
});

export default Router;

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  actions: {
    setFlashMessage(msg){
      Ember.set(this.controller, 'flashMessage', msg);
    }
  }
});

routes.my-route.js

import Ember from 'ember';

const {
  Route,
  RSVP: { reject }
} = Ember;

export default Route.extend({
  model(){
    console.log('The model fires.');
    return reject("ERRRROORRRR!!");
  },
  afterModel(){
    console.log('This will never be called. The afterModel does not fire.');
  },
  actions: {
    error(error, transition){
      transition.send('setFlashMessage', error);
    }
  }
});

templates.application.hbs

{{flashMessage}}
<h1>Welcome to {{appName}}</h1>
<br>
{{#link-to "my-route"}}My Route{{/link-to}}
<br>
{{outlet}}
<br>
<br>

templates.my-route-error.hbs

<h2>My Route Error Template</h2>

templates.my-route.hbs

<h2>My Route</h2>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}