Android - Getting multiple errors while building the project

Question

I am getting these errors while building the project

1. Failed to resolve: firebase-core
2. Failed to resolve: multidex
3. Failed to resolve: play-service

Answer 1

Have you tried rebuilding the app? Also make sure you are using the latest version of GMS. As a sidenote you dont need to add the entire gms library, you can add selective services. I see you have added gms- and gms-ads, which would already be included in the main gms.