Android app does not connect to Firebase

Question

I\'m developing android app using Firebase GMS service.
I tried to follow their tutorials, i made project as they said, downloaded the json files.

But when I

Answer 1

in build.gradle (Module.app) if you use view binding, comment it temporarily, then sync!

/*
viewBinding {
   enabled = true
}
*/

then connect to firebase. I use AS 4.0. please rate up if this help you, thanks!