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Created from b/126443924#comment8:

after added        
         maven {
            url 'http://storage.googleapis.com/r8-releases/raw'
        }
        maven {
            url 'https://kotlin.bintray.com/kotlinx/' // Only needed if you use Kotlin.
        }
and          classpath 'com.android.tools:r8:1.4.93'  // Must be before the Gradle Plugin for Android.
not build failed this error.
but new error is:
Cause: buildOutput.apkData must not be null