Android Material and appcompat Manifest merger failed

I had similar problem. Added two lines in gradle.properties file:

android.useAndroidX=true
android.enableJetifier=true

These two lines automatically resolved my dependency conflicts between google's files and third party dependencies. Here's the link to follow: https://developer.android.com/topic/libraries/support-library/androidx-overview#new-project

I faced same error when i try to add Kotlin-KTX library to my project.

I try to AndroidX migration, and problem fixed!