Flutter integration, iOS 13 simulator error. works in iOS 12

I'm guessing I missed some instruction for special consideration in this version of iOS.
Here is my code, in main.dart (My key in place of the x's )
await Qonversion.launch('XXXXXXXXXXXXXXXX',
isObserveMode: false);
When I launch Qonversion with my Flutter app using an iOS 13 simulator I get this error:

flutter: PlatformException(9, Could not parse response, Qonversion Error Code: 17, null)

This works in an iOS 12 simulator.

Is this enough information to tell me what I did wrong?