Hey @mcombatti so we found out the cause of the problem, sometimes when renaming the package and then deleting a part of it it accedntiatly delete the MainActivity.kt file
Do you have access to the Desktop version of Nowa? if yes all what you need to do is to create a file called MainActivity.kt inside Android>app>src>main>kotlin>sdww>eihef>finein (The sdww>eihef>finein is for your project package name)
And paste the following content:
package sdww.eihef.finein
import io.flutter.embedding.android.FlutterActivity
class MainActivity: FlutterActivity() {
}
If you don’t have Nowa desktop, then we will do this manually for you to add the file, and also fix the problem that caused the deletion for the file. We appologize for that 
