如何修复突然崩溃的应用程序？

Question

我在我的应用程序中添加了“ admob”，每当我运行我的应用程序时，我一遍又一遍地遇到相同的错误“ E / FirebaseInstanceId：令牌检索失败：SERVICE_NOT_AVAILABLE”

我一直在这里寻找堆栈溢出的解决方案，但没有成功。

apply plugin: 'com.android.application'

android {
compileSdkVersion 28
defaultConfig {
    applicationId "com.example.shrinkio"
    minSdkVersion 22
    targetSdkVersion 28
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner
    "android.support.test.runner.AndroidJUnitRunner"
    vectorDrawables.useSupportLibrary = true
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android- 
   optimize.txt'), 'proguard-rules.pro'
    }
     }
}

 dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraintlayout:1.1.3'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support:support-vector-drawable:28.0.0'
implementation 'com.android.support:customtabs:28.0.0'
implementation 'com.android.support:support-v4:28.0.0'
implementation 'com.android.support:recyclerview-v7:28.0.0'
implementation 'android.arch.lifecycle:extensions:1.1.1'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.google.firebase:firebase-core:16.0.8'
implementation 'com.google.firebase:firebase-auth:16.2.1'
implementation "com.google.android.gms:play-services-gcm:16.1.0"
implementation 'com.android.support:cardview-v7:28.0.0'
implementation 'com.google.android.gms:play-services-ads:17.2.0'
}


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