How to fix Error:Could not find com.google.gms: google-services: 3.0.0.?

I had similar problem, I copied the dependency from the firebase instructions and pasted in code.

From instructions:

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

Supposed to be:

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

Should not include any spaces. Silly but wasted half an hour.

Please add google-services.json in your app folder.

Add the class path line in the top level gradle file. Not in the same file where you add individual dependencies.