Ошибка по умолчанию FirebaseApp не инициализирована

Я вижу несколько исключений с сообщением Default FirebaseApp is not initialized in this process com.armoured. Make sure to call FirebaseApp.initializeApp(Context) first.

Трассировка стека приведена ниже:

2019-03-12 20:42:33.607 11511-11511/com.armoured E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.armoured, PID: 11511
java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.armoured. Make sure to call FirebaseApp.initializeApp(Context) first.
    at com.google.firebase.FirebaseApp.getInstance(com.google.firebase:firebase-common@@16.0.1:219)
    at com.google.firebase.auth.FirebaseAuth.getInstance(Unknown Source:1)
    at com.armoured.fragments.LoginFragment.onCreateView(LoginFragment.java:59)
    at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2439)
    at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1460)
    at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)
    at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852)
    at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:802)
    at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625)
    at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)
    at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)
    at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2273)
    at androidx.fragment.app.FragmentManagerImpl.dispatchStateChange(FragmentManager.java:3273)
    at androidx.fragment.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:3229)
    at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:201)
    at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:620)
    at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:178)
    at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1391)
    at android.app.Activity.performStart(Activity.java:7165)
    at android.app.ActivityThread.handleStartActivity(ActivityThread.java:2975)
    at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:180)
    at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:165)
    at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:142)
    at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:70)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:193)
    at android.app.ActivityThread.main(ActivityThread.java:6718)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

Моя проблема точно такая же, как и в вопросе это. Однако ни одно из решений в этом вопросе не сработало для меня. Я уже добавил apply plugin: 'com.google.gms.google-services' в свой файл Gradle. Я использую firebase:16.0.3 зависимости во всем своем коде.

И последняя деталь: я уже добавил FirebaseApp.initializeApp(Context) в свой фрагмент. Для полноты я добавляю функцию, в которой я получаю эту ошибку, к вопросу, чтобы вы, ребята, могли иметь контекст об ошибке.

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    FirebaseApp.initializeApp(getActivity());
    View view = inflater.inflate(R.layout.fragment_login, container, false);
    mViewModel = ViewModelProviders.of(this).get(LoginViewModel.class);
    mAuth = FirebaseAuth.getInstance();
    ButterKnife.bind(this,view);
    return view;
}

Обновлено: я прилагаю файл уровня градиента уровня приложения по запросу.

apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.armoured"
        minSdkVersion 23
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    api 'com.google.android.material:material:1.0.0-beta01'
    implementation 'androidx.cardview:cardview:1.0.0'
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.0-beta01'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.2'
    implementation 'com.jakewharton:butterknife:10.1.0'
    implementation 'com.google.firebase:firebase-core:16.0.3'
    implementation 'com.google.firebase:firebase-auth:16.0.3'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0-beta01'
    implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0-beta01'
    implementation 'androidx.recyclerview:recyclerview:1.0.0-beta01'
    annotationProcessor 'com.jakewharton:butterknife-compiler:10.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.0-alpha4'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha4'

}