&引用；程序类型已经存在：com.google.android.gms.common.api.internal.zzb“；如何为adMob解决此问题？

我使用的是Android Studio 3.3（最新版本）。图书馆复制的问题是什么？这些是谷歌AdMob网站上显示的最新步骤

implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.0.0-beta01'
    implementation 'androidx.core:core-ktx:1.1.0-alpha04'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.0-alpha4'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha4'
    implementation 'androidx.recyclerview:recyclerview:1.0.0'
    implementation 'com.mikhaellopez:circularimageview:3.2.0'
    implementation 'com.github.aakira:expandable-layout:1.6.0@aar'
    implementation 'androidx.cardview:cardview:1.0.0'
    implementation 'androidx.gridlayout:gridlayout:1.0.0'

    implementation 'com.github.stfalcon:stfalcon-imageviewer:0.1.0'

    implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha2'

    //UI
    implementation 'com.squareup.picasso:picasso:2.71828'
    implementation 'com.google.android.material:material:1.0.0'

    implementation 'xyz.belvi.mobilevision:barcodescanner:2.0.3'

    //adMob
    implementation 'com.google.android.gms:play-services-ads:17.1.1'

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通过将com.google.android.gms:play services广告的版本降级到其他谷歌play服务的版本来解决这个问题