Error: The method 'clampDouble' isn't defined for the class '_DropdownMenuPainter'

I'm using https://pub.dev/packages/dropdown_button2/versions/1.8.0/

I'm using exapmle, error this:

Error: The method 'clampDouble' isn't defined for the class '_DropdownMenuItemButtonState'.

Error: The method 'clampDouble' isn't defined for the class '_DropdownMenuPainter'.

Flutter 3.0.5