Google maps don't works

Hi,
I want to add googlemaps to my app so I’ve been following this tutorial : http://www.joshmorony.com/ionic-2-how-to-use-google-maps-geolocation-video-tutorial/
But it don’t works, if I copy the source code, I have a blank page… :

Can you help me please ?

Thanks

I would suggest you contact Josh with your issue.