FAILURE: Build failed with an exception.

[ddean6232]

registerResGeneratingTask is deprecated, use registerGeneratedFolders(FileCollection)
registerResGeneratingTask is deprecated, use registerGeneratedFolders(FileCollection)
registerResGeneratingTask is deprecated, use registerGeneratedFolders(FileCollection)

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:processDebugGoogleServices'.
> File google-services.json is missing. The Google Services Plugin cannot function without it. 
   Searched Location:
  R:\multiple-counters-flutter-master\android\app\src\nullnull\debug\google-services.json
  R:\multiple-counters-flutter-master\android\app\src\debug\nullnull\google-services.json
  R:\multiple-counters-flutter-master\android\app\src\nullnull\google-services.json
  R:\multiple-counters-flutter-master\android\app\src\debug\google-services.json
  R:\multiple-counters-flutter-master\android\app\src\nullnullDebug\google-services.json
  R:\multiple-counters-flutter-master\android\app\google-services.json

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

* Get more help at https://help.gradle.org
BUILD FAILED in 31s
Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

What should I do about this?