Ionic side menu (from official tutorial) show blank page

Hello Guys,

Im just getting started with Ionic framework (and Cordova). I followed the tutorial but when i run it, the content displayed only for a blink of eye then it disapears (hence showing a blank page).

This is the detail of my code (Please see the update in my question) :

Im very eager to learn Ionic, please kindly help me :smile: