Почему крашится приложение?

Question

[mezigar]

Хочу сверстать такую же страницу

Но приложение крашится с ошибкой, которую не получается загуглить, без салйдера всё работает, как надо.
Вот код (ошибка скорее всего связана с HorizontalSlider) :

import 'package:flutter/material.dart';

void main() => runApp(WeatherApp());

class WeatherApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      color: Colors.red,
      home: WeatherForecast(),
    );
  }
}

Widget WeatherForecast() {
  return Scaffold(
    backgroundColor: Colors.red,
    appBar: AppBar(
      centerTitle: true,
      backgroundColor: Colors.red,
      title: Text(
        'Weather Forecast',
        textAlign: TextAlign.center,
      ),
    ),
    body: MainFrame(),
  );
}

class HorizontalSlider extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => new _HorizontalSlider();
}

Widget MainFrame() {
  return Column(
    children: [
      SearchBar(),
      Divider(),
      MyLocation(),
      Divider(),
      CurrentWeather(),
      Divider(),
      Characteristics(),
      Divider(),
      Divider(),
      Text(
        '7-DAY WEATHER FORECASST',
        style: TextStyle(
          fontSize: 20,
          color: Colors.white,
        ),
      ),
      HorizontalSlider(),
    ],
  );
}

Widget SearchBar() {
  return Row(
    children: [
      IconButton(
        onPressed: () {},
        icon: Icon(
          Icons.search,
        ),
        color: Colors.white,
      ),
      Text(
        'Enter City Name',
        style: TextStyle(fontSize: 17, color: Colors.white),
      ),
    ],
  );
}

Widget MyLocation() {
  return Padding(
    padding: EdgeInsets.all(12),
    child: Column(
      children: [
        Text(
          'Ryazan Oblast, Ru',
          style: TextStyle(
            color: Colors.white,
            fontSize: 30,
          ),
        ),
        Text(
          'Saturday, May 3, 2022',
          style: TextStyle(
            color: Colors.white,
            fontSize: 18,
          ),
        ),
      ],
    ),
  );
}

Widget CurrentWeather() {
  return Padding(
    padding: EdgeInsets.fromLTRB(
      100,
      20,
      100,
      20,
    ),
    child: Row(
      children: [
        Icon(
          Icons.wb_sunny,
          color: Colors.white,
          size: 80,
        ),
        SizedBox(
          width: 10,
        ),
        Column(
          children: <Widget>[
            Text(
              '14 °F',
              style: TextStyle(
                fontSize: 30,
                color: Colors.white,
              ),
            ),
            Text(
              'Light Snow',
              style: TextStyle(
                fontSize: 18,
                color: Colors.white,
              ),
            ),
          ],
        )
      ],
    ),
  );
}

Widget Characteristics() {
  return Row(
    mainAxisAlignment: MainAxisAlignment.spaceEvenly,
    children: <Widget>[
      CharacteristicsDetail('5', 'km/hr'),
      CharacteristicsDetail('3', '%'),
      CharacteristicsDetail('20', '%'),
    ],
  );
}

Widget CharacteristicsDetail(String text1, String text2) {
  return Column(
    children: [
      Icon(
        Icons.snowing,
        size: 60,
        color: Colors.white,
      ),
      Text(
        text1,
        style: TextStyle(
          fontSize: 28,
          color: Colors.white,
        ),
      ),
      Text(
        text2,
        style: TextStyle(
          fontSize: 16,
          color: Colors.white,
        ),
      )
    ],
  );
}

class _HorizontalSlider extends State<HorizontalSlider> {
  @override
  Widget build(BuildContext context) {
    return ListView(
      scrollDirection: Axis.horizontal,
      itemExtent: 100,
      children: [
        CustomCard(
          'Friday',
          '6°F',
        ),
        CustomCard(
          'Saturday',
          '5°F',
        ),
        CustomCard(
          'Saturday',
          '5°F',
        ),
        CustomCard(
          'Sunday',
          '7°F',
        ),
        CustomCard(
          'Monday',
          '8°F',
        ),
        CustomCard(
          'Tuesday',
          '4°F',
        ),
        CustomCard(
          'Wednesday',
          '6°F',
        ),
        CustomCard(
          'Thursday',
          '9°F',
        ),
      ],
    );
  }
}

Widget CustomCard(String dayOfWeek, String temperature) {
  return Card(
    margin: EdgeInsets.all(30),
    color: Colors.redAccent,
    child: Column(
      children: <Widget>[
        Text(
          '$dayOfWeek',
          style: TextStyle(
            fontSize: 24,
            color: Colors.white,
          ),
        ),
        Row(
          children: [
            Text(
              '$temperature',
              style: TextStyle(
                fontSize: 24,
                color: Colors.white,
              ),
            ),
            Icon(
              Icons.wb_sunny,
              color: Colors.white,
            )
          ],
        )
      ],
    ),
  );
}