I created a paper wallet address that I like to use.
I want to import it on my Bitcoin app on my phone, but when I scan the private code I cant import it because it says it's empty.
I just want that newly generated address to be on my phone. How can I do this?
Depends on the app you use. Maybe if you tell us which you use, we can tell you how to do it. Most phone wallets however only allow you to "wipe" a private key, that is to use once and transfer all funds associated with it to an address the app controls. Depending on the way the app allows you to create a backup an imported key is not part of it. This is true for "HD" wallets, which create a backup in form of a seed (usually several words).