/Dart/The argument type 'Color?' can't be assigned to the parameter type 'MaterialColor?'

The argument type 'Color?' can't be assigned to the parameter type 'MaterialColor?'

MaterialColor swatchify(MaterialColor color, int value) {
  return MaterialColor(color[value].hashCode, <int, Color>{
    50: color[value],
    100: color[value],
    200: color[value],
    300: color[value],
    400: color[value],
    500: color[value],
    600: color[value],
    700: color[value],
    800: color[value],
    900: color[value],
  });
}

primarySwatch: swatchify(Colors.purple, 900),

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