Unable to see components

I am trying to test ionic 4 . But components are not getting visible/hidden
I am using these current versions

ionic info

Ionic:

ionic (Ionic CLI) : 4.1.1 (C:\Users\Bingo\AppData\Roaming\npm\node_modules\ionic)
Ionic Framework : ionic-angular 3.9.2
@ionic/app-scripts : 3.2.0

Cordova:

cordova (Cordova CLI) : not installed
Cordova Platforms : not available
Cordova Plugins : not available

System:

Android SDK Tools : 26.1.1 (C:\Android\sdk)
NodeJS : v8.11.3 (C:\Program Files\nodejs\node.exe)
npm : 6.4.0
OS : Windows 10