Android Question Compiling error

Make sure to configure Android SDK as explained here: https://www.b4x.com/b4a.html

already checked.
On other projects of mine (on the same machine) it works.
I copied the same detail (manifest, AdditionalRes, variable declaration, ...) into a new project but I receive this error and I not understend where is the problem.

No #AdditionalRes is needed with Firebase.

? great!
Now it works.

Both declarations (Initialize and Initialize2, like attachment) are necessary?
The first code (with ~) is the ID APP, the second (with /) is the ID banner.
I understood that Initialize is used only for the default size (320dip x 50dip).

With AdMob object, ID Banner is managed using mwAdInterstitial object.
Using FirebaseAdMob where ID APP must be placed?