How to fix "Too many positional arguments: 1 expected, but 3 found." issue in flutter - flutter

Question

I'm new to flutter.
I need to get product information through a form using flutter provider.
I can get one object(like String name value only). But when I add multiple parameters, it shows the following error.
Too many positional arguments: 1 expected, but 3 found.
This is the code I wrote.
Model class
class Item {
String itemName;
String description;
double itemPrice;
Item(this.itemName, this.description, this.itemPrice);
}
ChangeNotifier class
class ItemAddNotifier extends ChangeNotifier {
List<Item> itemList = [];
addItem(String itemName, String description, double itemPrice) {
Item item = Item(itemName, description, itemPrice);
itemList.add(item);
notifyListeners();
}
}
Add items
class AddItems extends StatelessWidget {
final TextEditingController _itemNameTextEditing = TextEditingController();
final TextEditingController _itemDescriptionTextEditing =
TextEditingController();
final TextEditingController _itemPriceTextEditing = TextEditingController();
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Kavishka'),
),
body: Container(
padding: EdgeInsets.all(30.0),
child: Column(
children: [
TextField(
controller: _itemNameTextEditing,
decoration: InputDecoration(
contentPadding: EdgeInsets.all(15.0),
hintText: 'Item Name',
),
),
SizedBox(
height: 20.0,
),
TextField(
controller: _itemDescriptionTextEditing,
decoration: InputDecoration(
contentPadding: EdgeInsets.all(15.0),
hintText: 'Item Description',
),
),
SizedBox(
height: 20.0,
),
TextField(
controller: _itemPriceTextEditing,
decoration: InputDecoration(
contentPadding: EdgeInsets.all(15.0),
hintText: 'Item Price',
),
),
SizedBox(
height: 20.0,
),
RaisedButton(
child: Text('ADD ITEM'),
onPressed: () async {
if (_itemNameTextEditing.text.isEmpty) {
return;
}
await Provider.of<ItemAddNotifier>(context, listen: false)
.addItem(
_itemNameTextEditing.text,
_itemDescriptionTextEditing.text,
_itemPriceTextEditing.text);
Navigator.pop(context);
},
),
],
),
),
);
}
}
Home Screen
class HomeScreen extends StatelessWidget {
const HomeScreen({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Kavishka'),
actions: [
IconButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
fullscreenDialog: true,
builder: (context) {
return AddItems();
},
),
);
},
icon: Icon(Icons.add))
],
),
body: Container(
padding: EdgeInsets.all(30.0),
child: Column(
children: [
Consumer<ItemAddNotifier>(builder: (context, itemAddNotifier, _) {
return ListView.builder(
scrollDirection: Axis.vertical,
shrinkWrap: true,
itemCount: itemAddNotifier.itemList.length,
itemBuilder: (context, index) {
return Padding(
padding: EdgeInsets.all(15.0),
child: Column(
children: [
Text(
itemAddNotifier.itemList[index].itemName,
style:
TextStyle(fontSize: 20.0, color: Colors.black),
),
],
),
);
});
})
],
),
),
);
}
}
Main
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return ChangeNotifierProvider(
create: (BuildContext context) {
return ItemAddNotifier();
},
child: MaterialApp(
home: Container(
color: Colors.white,
child: HomeScreen(),
),
),
);
}
}
It shows the error in Item item = Item(itemName, description, itemPrice); line.
If someone can help me to fix this issue.
Thank you.