log

E/CloudFirestorePlugin(21506): java.lang.Exception: Do transaction failed.
E/CloudFirestorePlugin(21506): java.util.concurrent.ExecutionException: java.lang.Exception: Do transaction failed.
E/CloudFirestorePlugin(21506): 	at com.google.android.gms.tasks.Tasks.zzb(Unknown Source:61)
E/CloudFirestorePlugin(21506): 	at com.google.android.gms.tasks.Tasks.await(Unknown Source:33)
E/CloudFirestorePlugin(21506): 	at io.flutter.plugins.firebase.cloudfirestore.CloudFirestorePlugin$4.apply(CloudFirestorePlugin.java:409)
E/CloudFirestorePlugin(21506): 	at io.flutter.plugins.firebase.cloudfirestore.CloudFirestorePlugin$4.apply(CloudFirestorePlugin.java:361)
E/CloudFirestorePlugin(21506): 	at com.google.firebase.firestore.FirebaseFirestore.lambda$runTransaction$1(com.google.firebase:firebase-firestore@@19.0.0:283)
E/CloudFirestorePlugin(21506): 	at com.google.firebase.firestore.FirebaseFirestore$$Lambda$3.call(Unknown Source:6)
E/CloudFirestorePlugin(21506): 	at com.google.android.gms.tasks.zzv.run(Unknown Source:2)
E/CloudFirestorePlugin(21506): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
E/CloudFirestorePlugin(21506): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
E/CloudFirestorePlugin(21506): 	at java.lang.Thread.run(Thread.java:764)
E/CloudFirestorePlugin(21506): Caused by: java.lang.Exception: Do transaction failed.
E/CloudFirestorePlugin(21506): 	at io.flutter.plugins.firebase.cloudfirestore.CloudFirestorePlugin$4$1$1.error(CloudFirestorePlugin.java:391)
E/CloudFirestorePlugin(21506): 	at io.flutter.plugin.common.MethodChannel$IncomingResultHandler.reply(MethodChannel.java:201)
E/CloudFirestorePlugin(21506): 	at io.flutter.embedding.engine.dart.DartMessenger.handlePlatformMessageResponse(DartMessenger.java:105)
E/CloudFirestorePlugin(21506): 	at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessageResponse(FlutterJNI.java:243)
E/CloudFirestorePlugin(21506): 	at android.os.MessageQueue.nativePollOnce(Native Method)
E/CloudFirestorePlugin(21506): 	at android.os.MessageQueue.next(MessageQueue.java:326)
E/CloudFirestorePlugin(21506): 	at android.os.Looper.loop(Looper.java:160)
E/CloudFirestorePlugin(21506): 	at android.app.ActivityThread.main(ActivityThread.java:6669)
E/CloudFirestorePlugin(21506): 	at java.lang.reflect.Method.invoke(Native Method)
E/CloudFirestorePlugin(21506): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
E/CloudFirestorePlugin(21506): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
D/AndroidRuntime(21506): Shutting down VM
E/AndroidRuntime(21506): FATAL EXCEPTION: main
E/AndroidRuntime(21506): Process: app, PID: 21506
E/AndroidRuntime(21506): java.lang.IllegalStateException: Reply already submitted
E/AndroidRuntime(21506): 	at io.flutter.embedding.engine.dart.DartMessenger$Reply.reply(DartMessenger.java:126)
E/AndroidRuntime(21506): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler$1.error(MethodChannel.java:230)
E/AndroidRuntime(21506): 	at io.flutter.plugins.firebase.cloudfirestore.CloudFirestorePlugin$3.onComplete(CloudFirestorePlugin.java:427)
E/AndroidRuntime(21506): 	at com.google.android.gms.tasks.zzj.run(Unknown Source:4)
E/AndroidRuntime(21506): 	at android.os.Handler.handleCallback(Handler.java:873)
E/AndroidRuntime(21506): 	at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(21506): 	at android.os.Looper.loop(Looper.java:193)
E/AndroidRuntime(21506): 	at android.app.ActivityThread.main(ActivityThread.java:6669)
E/AndroidRuntime(21506): 	at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(21506): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
E/AndroidRuntime(21506): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)