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

java android android-gradle-plugin android-manifest androidx

I think you are migrating to AndroidX libs.

Add below lines to gradle.properties file

android.useAndroidX=trueandroid.enableJetifier=true

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

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

java android android-gradle-plugin android-manifest androidx

You can try adding:

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

To the tag <application > in your manifest.

java android android-gradle-plugin android-manifest androidx

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

Android Studio > Refactor > Migrate to AndroidX

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