Firebase使用Firebase UI身份验证登录错误

Question

我正在关注this tutorial。 它应该转到HomeActivity，但不是：而是显示MainActivity。 我是编码新手，不知道该怎么做。

我已经将SHA-1添加到Firebase。

E/AuthUI: A sign-in error occurred.
    com.firebase.ui.auth.FirebaseUiException: Error when saving credential.
        at com.firebase.ui.auth.viewmodel.smartlock.SmartLockHandler$1.onComplete(SmartLockHandler.java:98)
        at com.google.android.gms.tasks.zzj.run(Unknown Source:4)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: com.google.android.gms.common.api.ApiException: 16: No eligible accounts can be found.
        at com.google.android.gms.common.internal.ApiExceptionUtil.fromStatus(Unknown Source:4)
        at com.google.android.gms.common.internal.zai.zaf(Unknown Source:2)
        at com.google.android.gms.common.internal.zaj.onComplete(Unknown Source:6)
        at com.google.android.gms.common.api.internal.BasePendingResult.zaa(Unknown Source:172)
        at com.google.android.gms.common.api.internal.BasePendingResult.setResult(Unknown Source:131)
        at com.google.android.gms.common.api.internal.BaseImplementation$ApiMethodImpl.setResult(Unknown Source:36)
        at com.google.android.gms.internal.auth-api.zzo.zzc(Unknown Source:4)
        at com.google.android.gms.internal.auth-api.zzv.dispatchTransaction(Unknown Source:9)
        at com.google.android.gms.internal.auth-api.zzd.onTransact(Unknown Source:12)
        at android.os.Binder.execTransact(Binder.java:731)