Query Param Error

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  queryParams: ['appName'],
  
  appName: null
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  queryParams: {
    appName: {
      replace: true,
      refreshModel: true
    }
  },
  
  beforeModel(transition) {
    let params = transition.queryParams;

    if (!params.appName) {
    	this.transitionTo({queryParams: { appName: 'poop' }});
    }
  }
});

templates.application.hbs

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

twiddle.json

{
  "version": "0.13.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}