问错误:不能将'Widget‘类型的值分配给'InheritedWidget’类型的变量

EN

I am having a problem with my project, there are no errors in my code but when I try to run main.dart it fails to build. The errors it throws are the following:

enter code here
// @dart=2.9
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:syncfusion_flutter_gauges/gauges.dart';
import 'package:http/http.dart' as http;
import 'Readings.dart';


class DashBoardPage extends StatefulWidget {

   const DashBoardPage({Key key}) : super(key: key);


  @override
  State<DashBoardPage> createState() => _DashBoardPageState();
}

class _DashBoardPageState extends State<DashBoardPage> {
  final String url = "http://mushroomdroid.online/dbscript-1.php";
  List<Readings> AllData = [];
  @override
  void initState() {
    super.initState();
    loadData();
  }


  loadData() async {
    var response =
    await http.get(Uri.parse(url), headers: {"Accept": "application/json"});
    if (response.statusCode == 200) {
      String responseBody = response.body;
      var jsonBody = json.decode(responseBody);
      for (var data in jsonBody) {
        AllData.add(Readings(
            int.parse(data['id']),
            double.parse(data['temperature']),
            double.parse(data['humidity']),
            data['FanStatus'],
            data['MistStatus'],
            DateTime.parse(data['Time'])));
      }
      setState(() {});
      //AllData.forEach((someData) => print("temperature: ${someData.temperature}"));
    } else {
      print('Something went wrong');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Container(
          child: AllData.isEmpty
              ? Center(
            child: CircularProgressIndicator(),
          )
              : showMyUI(),
        ));
  }

  Widget showMyUI() {
    return ListView.builder(
        itemCount: 1,
        itemBuilder: (_, index) {
          return Card(
            child: Container(
              decoration: BoxDecoration(
                  image: DecorationImage(
                    image: AssetImage('assets/whitelast.jpg'),
                    fit: BoxFit.cover,
                  )),
              padding: EdgeInsets.all(12.0),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: <Widget>[
                  Text("Dashboard",
                      style: TextStyle(fontFamily: 'OpenSans', fontSize: 25)),
                  Text("Latest reading for today,\n${AllData.first.petsa}"),
                  SfRadialGauge(axes: <RadialAxis>[
                    RadialAxis(
                        startAngle: 180,
                        endAngle: 360,
                        showTicks: false,
                        showLabels: false,
                        radiusFactor: 0.8,
                        pointers: <GaugePointer>[
                          RangePointer(
                              value: AllData.last.temperature,
                              cornerStyle: CornerStyle.bothCurve,
                              width: 10,
                              sizeUnit: GaugeSizeUnit.logicalPixel,
                              gradient: const SweepGradient(colors: <Color>[
                                Color(0xFFffd800),
                                Color(0xFFffba00)
                              ], stops: <double>[
                                0.25,
                                0.75
                              ])),
                        ],
                        annotations: <GaugeAnnotation>[
                          GaugeAnnotation(
                            positionFactor: 0.7,
                            angle: 90,
                            widget: Column(
                              children: <Widget>[
                                Container(
                                    width: 100.00,
                                    height: 100.00,
                                    decoration: BoxDecoration(
                                      image: DecorationImage(
                                        image: ExactAssetImage(
                                            'assets/qwe.png'),
                                      ),
                                    )),
                                Padding(
                                  padding: EdgeInsets.fromLTRB(0, 2, 0, 0),
                                  child: Text(
                                      '       ${AllData.first.temperature}\n Temperature',
                                      style: TextStyle(
                                          fontFamily: 'OpenSans',
                                          fontWeight: FontWeight.normal,
                                          fontSize: 25)),
                                )
                              ],
                            ),
                          )
                        ])
                  ]),
                  SfRadialGauge(axes: <RadialAxis>[
                    RadialAxis(
                      startAngle: 180,
                      endAngle: 360,
                      annotations: <GaugeAnnotation>[
                        GaugeAnnotation(
                            positionFactor: 0.7,
                            angle: 90,
                            widget: Column(
                              children: <Widget>[
                                Container(
                                    width: 70.00,
                                    height: 70.00,
                                    decoration: BoxDecoration(
                                        image: DecorationImage(
                                          image:
                                          AssetImage('assets/images(2).jpg'),
                                        ))),
                                Padding(
                                  padding: EdgeInsets.fromLTRB(0, 2, 0, 0),
                                  child: Text(
                                      '     ${AllData.first.humidity}\n Humidity',
                                      style: TextStyle(
                                          fontWeight: FontWeight.normal,
                                          fontSize: 25)),
                                )
                              ],
                            ))
                      ],
                      radiusFactor: 0.8,
                      showLabels: false,
                      showTicks: false,
                      pointers: <GaugePointer>[
                        RangePointer(
                            value: AllData[index].humidity,
                            cornerStyle: CornerStyle.bothCurve,
                            width: 10,
                            sizeUnit: GaugeSizeUnit.logicalPixel,
                            gradient: const SweepGradient(colors: <Color>[
                              Color(0xFF00FFFF),
                              Color(0xFF6495ED)
                            ], stops: <double>[
                              0.25,
                              0.75
                            ])),
                      ],
                    )
                  ])
                ],
              ),
            ),
          );
        });
  }
}