[SOLVED] Task :app:uploadCrashlyticsMappingFileRelease FAILED Expected file collection to contain exactly one file, however, it contains no files

Task :app:uploadCrashlyticsMappingFileRelease FAILED Expected file collection to contain exactly one file, however, it contains no files

I have implemented Firebase crashlytics as suggested. I have put this in my app level release build variant:

firebaseCrashlytics
  {
    mappingFileUploadEnabled true
  }

but when I start to build signed apk I am always getting this error

Task :app:uploadCrashlyticsMappingFileRelease FAILED

FAILURE: Build failed with an exception.

What went wrong: Execution failed for task ':app:uploadCrashlyticsMappingFileRelease'.

Expected file collection to contain exactly one file, however, it contains no files.

If I set mappingFileUploadEnabled to false then release apk builds successfully. I have searched a lot but couldn't find a work around. Anyone can help?

Solution

Error: "Crashlytics could not find Google Services plugin task: processReleaseGoogleServices. Make sure com.google.gms.google-services is applied BEFORE com.google.firebase.crashlytics. If you are not using the Google Services plugin, you must explicitly declare googleServicesResourceRoot inputs for Crashlytics upload tasks."

I had something like this in build.gradle

apply plugin: 'com.google.firebase.crashlytics'
apply plugin: 'com.google.gms.google-services'

changed it to this and voila! it works:

apply plugin: 'com.google.gms.google-services'
apply plugin: 'com.google.firebase.crashlytics'