Error in connection establishment: net::ERR_CONNECTION_REFUSED

I'm creating live chat application using laravel + emberJS. I follow the tutorials in the website. But when I comes to the end, I got connection establishment error on my port. Currently I'm running localhost from XAMPP, open with google chrome. I'm completely newbie to EmberJS, I don't know how they actually run the server. All I knew about my problem is my port is not match with the browser I surf.

Here's the tutorials I followed. Their source codes also get the same errors.