当我在build.gradle文件中添加play services代码时，我的应用程序返回奇怪的错误； implementation 'com.google.android.gms:play-services-ads:19.6.0' 错误是，

Duplicate class com.google.android.gms.internal.measurement.zzkf found in modules jetified-firebase-analytics-impl-15.0.2-runtime (com.google.firebase:firebase-analytics-impl:15.0.2) and jetified-play-services-measurement-base-17.5.0-runtime (com.google.android.gms:play-services-measurement-base:17.5.0)