six_ft_apart_rounded
This is Flutter 2.8 bug. Change those lines in this Location:
C:flutter.pub-cachehostedpub.dartlang.org
flutter_iconpicker-3.0.4libIconPickerPacksMaterial.dart
// (Use double under score to the Icons.six__
'six_ft_apart': Icons.six__ft_apart,
'six_ft_apart_sharp': Icons.six__ft_apart_sharp,
'six_ft_apart_rounded': Icons.six__ft_apart_rounded,
'six_ft_apart_outlined': Icons.six__ft_apart_outlined,