cannot run null safety

[itsdani121]

here i got error when i use this package

           Error: Cannot run with sound null safety, because the following dependencies
          don't support null safety:

       - package:month_picker_dialog

       For solutions, see https://dart.dev/go/unsound-null-safety
        /C:/src/flutter_windows_2.0.6-stable/flutter/.pub-cache/hosted/pub.dartlang.org/month_picker_dialog- 
          0.2.3/lib/month_picker_dialog.dart:114:24: Error: Method not
          found: 'ButtonTheme.bar'.
           return ButtonTheme.bar()

kindly update your package which give error

[Macacoazul01]

i`m maintaining an updated version of this package, and this is fixed there
https://pub.dev/packages/month_picker_dialog_2