Hello,
Android Studio uses the following ext.kotlin_version = '1.3.60', your version being lower it can create conflicts such as those described in this file:
kotlin_migration
Of course, it can be updated in AS, so my real concern is why are you using kotlin,? A flutter dart native app is aiming to run on ios and android, the native language of an android app is in java and does not need kotlin in is built to run.
Are you aiming to change that, meaning no longer using kotlin or if not are you aiming to work for a better migration to kotlin if you keep on with it?
Yours