setState() or markNeedsBuild() called during build. The relevant error causing widget was RoundIconButton. A RenderFlex overflowed

0
votes
int weight = 60;

Widgets under Scaffold:-


Expanded(
              child: Row(
            children: [
              Expanded(
                child: ReusableCard(
                  cardChild: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      Text(
                        'WEIGHT',
                        style: kLabelTextStyle,
                      ),
                      Text(
                        weight.toString(),
                        style: kNumberTextStyle,
                      ),
                      Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          RoundIconButton(
                            onPressed: add,
                            icon: FontAwesomeIcons.minus,
                          ),
                          SizedBox(
                            width: 10.0,
                          ),
                          RoundIconButton(
                            onPressed: add,
                            icon: FontAwesomeIcons.plus,
                          ),
                        ],
                      )
                    ],
                  ),
                  colour: kCardColor,
                ),
              ),
          

class RoundIconButton extends StatelessWidget {
  RoundIconButton({required this.icon, required this.onPressed});

  final IconData icon;
  final Function onPressed;
  @override
  Widget build(BuildContext context) {
    return RawMaterialButton(
      onPressed: onPressed(),
      child: Icon(icon),
      shape: CircleBorder(),
      fillColor: Color(0xff4c4f5e),
      constraints: BoxConstraints.tightFor(
        width: 56.0,
        height: 56.0,
      ),
    );
  }
}

Debug Console:- This InputPage widget cannot be marked as needing to build because the framework is already in the process of building widgets. A widget can be marked as needing to be built during the build phase only if one of its ancestors is currently building. This exception is allowed because the framework builds parent widgets before children, which means a dirty descendant will always be built. Otherwise, the framework might not visit this widget during this build phase.

The widget which was currently being built when the offending call was made was: RoundIconButton dirty

I am trying to add floating buttons, which when pressed increments or decrements the weight displayed. Can anyone help me out as I am new to flutter?

fluttersetstate