Could not find property ‘outputFile’ on com.android.build.gradle.internal.api.ApplicationVariantImpl

try this

applicationVariants.all { variant ->
    variant.outputs.each { output ->
        def file = output.outputFile
        output.outputFile = new File(file.parent, file.name.replace(".apk", "-" + defaultConfig.versionName + ".apk"))
    }
}