trying to set Paint() color to primary theme

Question

trying to set the color to the primary theme in my flutter app, get an error where context is saying The argument type 'PaintingContext' can't be assigned to the parameter type 'BuildContext'. any idea how to fix this?

   final paint = Paint()

  ..color = Theme.of(context).colorScheme.primary; //Thumb Background Color
  ..style = PaintingStyle.fill;