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I am using the latest Android studio build (of 2023.3.1.) I'm trying to include the following package:

import androidx.appcompat.app.AppCompatActivity

I get the following error: (referring to line 3 of MainActivity.kt)

Unresolved reference: app: 3

Why can't this package be found? What has this package been superseded by?

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  • Well how are you adding the dependency for that class? Also, is that the whole error? "app: 3" makes little sense ... Commented May 18, 2024 at 2:33
  • Ok, found the solution eventually. In build.gradle.kts, add this to dependencies: dependencies { val appcompat_version = "1.6.1" implementation("androidx.appcompat:appcompat:$appcompat_version") [See: developer.android.com/jetpack/androidx/releases/appcompat#kts] I also did: 'clean project' and 'rebuild project'. Commented May 19, 2024 at 3:36
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