How to solve “A RenderFlex overflowed by 143 pixels on the right.” error in text?

Just Wrap you – Card with –Flexible Widget.

Row(
    children: <Widget>[
      Flexible(
        child: Card(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              Text("Item name mmmasdaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaammmmmm"),
              SizedBox(height: 15.0,),
              Text(
                "Discount mmmmmmmm",
              ),
              SizedBox(height: 5.0,),
              Text(
                "Price ,mmmmmmmmmdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfdgfmmmmmmmmm",
              )
            ],
          ),
        ),
      ),
    ],
  ),