Reload cached Network Image upon failure

I have class for images that are displayed in a listview. Sometimes the image fails and setstate does not reload the image nor any method that I have thought of works, even when assigning a unique key value.

The image class returns this code:

CachedNetworkImage(
        imageUrl: widget.url,
        fit: BoxFit.fitWidth,
        progressIndicatorBuilder: (context, url, downloadProgress) =>
            Container(
              alignment: Alignment.center,
              height: MediaQuery.of(context).size.height * 0.5,
              width: MediaQuery.of(context).size.width,
              child: CircularProgressIndicator(
                  value: downloadProgress.progress),
            ),
            errorWidget: (){
              return Container(
                alignment: Alignment.center,
                height: MediaQuery.of(context).size.height * 0.5,
                width: MediaQuery.of(context).size.width,
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  crossAxisAlignment: CrossAxisAlignment.center,
                  children: [
                    Icon(
                      Icons.perm_scan_wifi,
                      color: Colors.grey[600],
                      size: 50,
                    ),
                    Padding(
                      padding: const EdgeInsets.only(bottom: 20, top: 25),
                      child: Text(
                        'Failed To Load Image',
                        style: TextStyle(color: Colors.white, fontSize: 17),
                      ),
                    ),
                    Padding(
                      padding: const EdgeInsets.only(
                          bottom: 12.0, left: 10, right: 10),
                      child: Text(
                        'Check your internet connection and try again.',
                        textAlign: TextAlign.center,
                        style: TextStyle(color: Colors.grey),
                      ),
                    ),
                    FlatButton(
                      shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(8)),
                      child: Text('Retry',
                          style: TextStyle(color: Colors.black)),
                      onPressed: () {
                        setState(() {});
                      },
                      color: Pigment.fromString('#FFCC00'),
                    )
                  ],
                ),
              );
            },
         
        )

Can you please propose a way to reload the image when it fails, I can only use cached network image, no other packages would be useful cuz I was the unique cache key feature.

You can copy paste run full code below
You can use ValueNotifier to change cacheKey of CachedNetworkImage
In working demo
Step 1: image is not loaded in airplane mode
Step 2: turn off airplane mode
Step 3: and click Retry button then _networklHasErrorNotifier.value++
Step 4: ValueListenableBuilder rebuild CachedNetworkImage with new cacheKey

code snippet

ValueNotifier<int> _networklHasErrorNotifier = ValueNotifier(0);
...
ValueListenableBuilder(
                valueListenable: _networklHasErrorNotifier,
                builder: (BuildContext context, int count, Widget child) {
                  print("rebuild");
                  return CachedNetworkImage(
                    cacheKey: _networklHasErrorNotifier.value.toString(),
...                 
onPressed: () {
        print("clicked");
        _networklHasErrorNotifier.value++;      
      },                    

working demo

full code

import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  ValueNotifier<int> _networklHasErrorNotifier = ValueNotifier(0);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            ValueListenableBuilder(
                valueListenable: _networklHasErrorNotifier,
                builder: (BuildContext context, int count, Widget child) {
                  print("rebuild");
                  return CachedNetworkImage(
                    cacheKey: _networklHasErrorNotifier.value.toString(),
                    imageUrl: "https://via.placeholder.com/350x150",
                    fit: BoxFit.fitWidth,
                    progressIndicatorBuilder:
                        (context, url, downloadProgress) => Container(
                      alignment: Alignment.center,
                      height: MediaQuery.of(context).size.height * 0.5,
                      width: MediaQuery.of(context).size.width,
                      child: CircularProgressIndicator(
                          value: downloadProgress.progress),
                    ),
                    errorWidget: (context, url, error) {
                      return Container(
                        alignment: Alignment.center,
                        height: MediaQuery.of(context).size.height * 0.5,
                        width: MediaQuery.of(context).size.width,
                        child: Column(
                          mainAxisAlignment: MainAxisAlignment.center,
                          crossAxisAlignment: CrossAxisAlignment.center,
                          children: [
                            Icon(
                              Icons.perm_scan_wifi,
                              color: Colors.grey[600],
                              size: 50,
                            ),
                            Padding(
                              padding:
                                  const EdgeInsets.only(bottom: 20, top: 25),
                              child: Text(
                                'Failed To Load Image',
                                style: TextStyle(
                                    color: Colors.white, fontSize: 17),
                              ),
                            ),
                            Padding(
                              padding: const EdgeInsets.only(
                                  bottom: 12.0, left: 10, right: 10),
                              child: Text(
                                'Check your internet connection and try again.',
                                textAlign: TextAlign.center,
                                style: TextStyle(color: Colors.grey),
                              ),
                            ),
                            FlatButton(
                              shape: RoundedRectangleBorder(
                                  borderRadius: BorderRadius.circular(8)),
                              child: Text('Retry',
                                  style: TextStyle(color: Colors.black)),
                              onPressed: () {
                                print("clicked");
                                _networklHasErrorNotifier.value++;
                                //setState(() {});
                              },
                              //color: Pigment.fromString('#FFCC00'),
                            )
                          ],
                        ),
                      );
                    },
                  );
                })
          ],
        ),
      ),
    );
  }
}