App only shows default image

Among many problems with Titanium, I am stuck on this. Building an app for Android , Titanium build 3.x

So I added code in app.js so it would only call main.js, but when my app is build and launches, it only shows default Titanium image!

Here is my app.js code

Titanium.UI.setBackgroundColor('#686868');

var win1 = Ti.UI.createWindow({ url : 'main/main.js' }); win1.open();

Any ideas?