“PlatformException (PlatformException (tidak diketahui, java.lang.exception: klien offline, {code: tidak diketahui, pesan: java.lang.exception: klien offline}, null))” Kode Jawaban

PlatformException (PlatformException (tidak diketahui, java.lang.exception: klien offline, {code: tidak diketahui, pesan: java.lang.exception: klien offline}, null))

You have to add the Firebase googleservices.json to android app in firebase 

googleservices.json
do the changes in build.gradle file and app build.gradle files
So Add the App in the Firebase using the same company name