Plugin with id 'com.google.gms.google-services' not found

Question

I have followed this link to integrate ads in my app. But it shows this error:

This is

Answer 1

I changed google-services classpath version from 4.2.0 to 3.0.0

classpath 'com.google.gms:google-services:3.0.0'

Then rebuild the project, Then strangely it suggested me to add firebase core to the project.

Then I added firebase core on the app(module)

implementation 'com.google.firebase:firebase-messaging:16.0.8'

Then the error disappeared magically.