Ionic v2 tabs - main.js missing

Hi,
I have created a project from base tabs template with
ionic start myTabs tabs --v2 but the main.js file is missing, but is being referenced form index.js like <script src="build/main.js"></script>

then when I add platform and run ionic serve it does nothing, I just can see that it’s missing main.js in firebug’s network tab.
Can you tell me why is that so and how to proceed?
This is my first ionic v2 app.

Thanks!

You probably need to update NPM and Node. See this thread for more details : Ionic2 rc0 (ionic cli 2.1): out of the box tutorial template ionic serve fails

that has helped!! thanks, start-up guide should notify people to update platform.