The instance member 'blueColorHexCode' can't be accessed in an initializer.
you can use the getter methods that can access these class objects inside the
methods.
class AppTheme {
final Color blueColorHexCode = Color(0xff3d63ff);
//App Bar Text
TextTheme get appBarTextTheme {
return TextTheme(
headline1: GoogleFonts.ibmPlexSans(
textStyle: TextStyle(color: grayColorHexCode),
),
);
}
........................
............................
}