how to implement a flutter aar in android native application

Question

I have a flutter application that I convert to module then generate a aar from it. After that I get the configuration steps to implement it in a native android project, but after following the steps I get an error in AndroidManifest that say: Unresolved package 'flutter'

<activity
    android:name="io.flutter.embedding.android.FlutterActivity"
    android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
    android:hardwareAccelerated="true"
    android:windowSoftInputMode="adjustResize"
    tools:ignore="MissingClass" />

how can i resolve this issue?