Flutter invalid refrence to 'this' expression - flutter

Question

i am trying to add item in list when i click on add button, all code is ok, but i am getting error invalid reference to this expression. i am using stateful widget.
List<Widget> _listSection = [];
body: Container(
child: Stack(
children: [
FloatingActionButton(
onPressed: () {
_listSection.add(
listSectionMethod(
"title three", "hello from click", Icons.forward),
);
setState(() {});
},
),
],
),
),
),
);
}
}
Widget listSection = Container(
margin: EdgeInsets.only(top: 210),
child: ListView(
children: [
Column(
children: [
Column(
children: this._listSection, // ----> ERROR HERE
),
],
),
],
),
);
List Section Method:
Card listSectionMethod(String title, String subtitle, IconData icon) {
return new Card(
child: ListTile(
title: Text(
title,
style: TextStyle(fontWeight: FontWeight.bold),
),
subtitle: Text(subtitle),
trailing: Icon(
icon,
color: Colors.blue,
),
),
);
}

Answer 1

change this:
Widget listSection = Container(
margin: EdgeInsets.only(top: 210),
child: ListView(
children: [
Column(
children: [
Column(
children: this._listSection,
),
],
),
],
),
);
for this:
Widget listSection() {
return Container(
margin: EdgeInsets.only(top: 210),
child: ListView(
children: [
Column(
children: this._listSection,
),
],
),
);
}