I want to build apk release on Flutter, I already follow and implemented this link: https://flutter.dev/docs/deployment/android for pro-guards, key, etc.
But when I run "flutter build apk". I get the error.
Can someone help me?
You need to migrate your project to AndroidX. Check this guideline to migrate to AndroidX. https://flutter.dev/docs/development/packages-and-plugins/androidx-compatibility#how-to-migrate-a-flutter-app-to-androidx