Showing snackbar from the error cause obtained by executing usecase

movie_page.dart

final loadMoviesResult = await loadPopularMoviesUsecase();
if(result is ErrorResult){
  final messenger = (String msg) => ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(msg)));
  result.errorCause.whenOrNull(error: (cause) {
    return cause.when(
      noInternet: () => messenger("Lost connection when loading popular movies"),
      unknown: () => messenger("Unexpected error happen when loading popular movies"),
    );
  });
}