The plugin `flutter_live` requires your app to be migrated to the Android embedding v2.

This app is using a deprecated version of the Android embedding.
To avoid unexpected runtime failures, or future build failures, try to migrate this app to the V2 embedding.
Take a look at the docs for migrating an app: https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects 

Follow the steps on the migration doc above and re-run this command.