Event Handlers in ember.js

I am trying to trigger an event from an Ember.js controller. I throws an error saying "ember.min.js:3 Uncaught Error: Nothing handled the action 'clicked'. If you did handle the action, this error can be caused by returning true from an action handler in a controller, causing the action to bubble.". Also I am not clear on how the event system works on itself for the targeted action. C an someone help me with this. Here is my code: http://ift.tt/1Ra8Bvr