Error during FCM registration. Please set your project ID

Question

I'm building a salesforce android kotlin mobile app and I'm currently implementing the push notifications feature. I have started my project from the forcedroid create template. I have added all necessary classpath and dependencies in project and app module's build.gradle files. I have followed these two guides:

Firebase setup

Salesforce Push Notifications Android Setup

The error mentioned in the title occurs when starting the main activity of the app after logging in (indeed it does not show when you start the app and you are already logged in). Since there are way too many files influenced by the changes I'm gonna post the code on demand, unless you want me to write everything here.

Thank you for your efforts, hope you can solve this issue, bye!