Ionic not defined but runs on web not on device?

Ionic Framework ionic-v3
1

please see imgur link:
http://imgur.com/A0NLSdW

2

What is the URL for this? This error sometimes happens when using ionicplatform in the URL instead of ionicPlatform.

3

it’s ?ionicplatform=android, but whenever I change the url to ionicPlatform, It still runs.