Error Android: "Your layout should make use of the available space on 10-inch tablets"

Hi, and here we go again with another error!
I’ve just released my app to production on GooglePlay, which should be compatible with Phones or Tablets,
but for GooglePlay my app is not compatible with tablets for two reasons:

Your layout should make use of the available space on 10-inch tablets

Your APK should include custom drawables assets for common tablet screen densities

Do you know guys how to get rid of these messages and make my app finally fully compatible with tablets?
(I read somewhere to add lines inside manifest section, but I don’t know what to add exactly…I tried with screens supports commands
but without success, probably I don’t know how to add them properly)
(I can however download and intall it on my Nexus 7 so I hope this is not a major problem)
Thanks

Hello, I have the same problem, I hope someone helps us with this