Running 'gulp serve' in Koding doesn't output the Web Starter Kit page

Hi I ahave problem on installing Web Starter Kit in cloud using Koding.com and when I run gulp serve the process stocks in this line '[WSK] Serving files from: app' then nothing happens

I installed Web Starter Kit by cloning the http://ift.tt/1q0E6LP $ npm install $ npm install gulp -g the running 'gulp serve'..

did I forgot anything that stops the process? or the problem is on the cloud (Koding.com) because when I run 'gulp pagespeed' my url is 'https://example.com/'. Why is that so?

I'll appreciate any help.