The reason I originally was not seeing this, is because I was using, when I changed to Android-15 I began getting the same errors that you were.
This is because you need to set your Android SDK Level to no lower than. Anything else will NOT work and this is an expected result of the engine. Only the minimum SDK and target SDK versions in Android Settings may be set lower than, but you must always compile Java with 19 or higher as it’s required.
You should be able to package after that has been set properly.