/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?'.

theme: ThemeData(
    colorScheme: ColorScheme.fromSwatch().copyWith(

      primary: const Colors.yellow[700],
      secondary: const Colors.yellow.shade700,

      // or from RGB

      primary: const Color(0xFF343A40),
      secondary: const Color(0xFFFFC107),

    ),
  ),

Source: stackoverflow.com

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