![flutter - The argument type 'Future<Uint8List?>' can't be assigned to the parameter type 'Future<Uint8List>? - Stack Overflow flutter - The argument type 'Future<Uint8List?>' can't be assigned to the parameter type 'Future<Uint8List>? - Stack Overflow](https://i.stack.imgur.com/BXJtw.png)
flutter - The argument type 'Future<Uint8List?>' can't be assigned to the parameter type 'Future<Uint8List>? - Stack Overflow
![Dart: Futures & Await/Async. Let's check in a very understandable… | by Juan Pablo García Nieto | Medium Dart: Futures & Await/Async. Let's check in a very understandable… | by Juan Pablo García Nieto | Medium](https://miro.medium.com/max/1400/1*4i2iIH693EJ_TwxO42D7lw.png)
Dart: Futures & Await/Async. Let's check in a very understandable… | by Juan Pablo García Nieto | Medium
An async function declared to return FutureOr<T> can't directly return a T · Issue #606 · dart-lang/language · GitHub
![Confusing error message: type '_Future' is not a subtype of type 'Future<bool>' · Issue #15654 · flutter/flutter · GitHub Confusing error message: type '_Future' is not a subtype of type 'Future<bool>' · Issue #15654 · flutter/flutter · GitHub](https://user-images.githubusercontent.com/1326504/37632680-ab6ee782-2bac-11e8-9621-5660ad1e0814.png)