How to build Ionic Framework in Android Platform?

I new in Ionic Framework so I just followed in getting started page on their page.. http://ionicframework.com/getting-started/

So I start a new project and I want to try to build it before to try how to make it an androids apps and I followed a tutorial (here: http://ccoenraets.github.io/ionic-tutorial/build-ionic-project.html) but sad to say I got an error when i try to build my project?

This is the error

enter image description here

What does it mean and why am I getting this error..I just followed the instruction.. I installed Android Studio as tutorial required. Where did I get wrong?