Android X: tools:replace specified at line: for attribute, but no new value specified

I think you are migrating to AndroidX libs.

Add below lines to gradle.properties file

android.useAndroidX=true
android.enableJetifier=true

Remove tools:replace="android:appComponentFactory" from manifest.

Replace android.support.v7.app.AppCompatActivity to androidx.appcompat.app.AppCompatActivity

Migrating to AndroidX

You can try adding:

android:appComponentFactory="android.support.v4.app.CoreComponentFactory"

To the tag <application > in your manifest.

I got same error in my project, I have resolved it You can try it

Android Studio > Refactor > Migrate to AndroidX

enter image description here

In my case, I had updated Firebase and play services dependency, result in this issue.

Reverted back the dependency updates and the error vanished

Seems that the latest Firebase and Play Service dependencies are compatible with androidx.

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