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

I recently update to Android studio 4.0 and got into this error. I was still using the obsolete way to add the databinding . Changing it to the updated way to use the data binding resolved my issue. Below is the code :

buildFeatures{
        dataBinding = true
        // for view binding :
        // viewBinding = true
    }