Ionic-native/network-interface, gives error the 'plugin not installed'?

Ionic Native
1

I am using ionic-native/network-interface for getting the ip address of wifi I am connected with but It gives error Plugin not installed but I have installed it using official documentation.

This is the code I have written

export class HomePage {

constructor(public navCtrl: NavController, private networkInterface: NetworkInterface ) {

this.networkInterface.getWiFiIPAddress().then(a=>alert(a)).catch(e=>alert(e));

}
}
Error: plugin not installed

And I have addeed NetworkInterface in the providers in app.module.ts