Problem with joining firebase in android app. How to attach a new module?

Question

Android

Good afternoon. I am writing a project on android studio using Realtime Database Firebase.
When connecting the project to firebase, there was 1 module. Everything works, the data is written, read.
Now we need to add the 2nd module. And now he does not want to connect to the firebase.
The error looks like this:
Default FirebaseApp is not initialized in this process myproject. Make sure to call FirebaseApp.initializeApp(Context) first

Here it is - FirebaseApp.initializeApp(Context) - where I didn't insert it, it doesn't help. Tell me how to be in such a situation.

Answer 1

Solved a problem. I did not take into account that each module must be attached separately.