await処理でエラーが発生　MissingPluginException

実現したいこと

現在、Windowsアプリでシリアル通信を行うために、 package usb_serial を使用しての機能の実現を目指しております。

前提

https://github.com/altera2015/usbserial
そこで、上記URLにあるソースの"main.dart","pubspec.yaml"をコピペし、実行を行ったところ、以下のようなエラーが出ました

発生している問題・エラーメッセージ

Resolving dependencies...
  collection 1.17.2 (1.18.0 available)
  material_color_utilities 0.5.0 (0.8.0 available)
Got dependencies!
Launching lib\main.dart on Windows in debug mode...
Building Windows application...
√  Built build\windows\runner\Debug\serial_comm.exe.
Debug service listening on ws://127.0.0.1:51368/fmj8FEKR9Cw=/ws
Syncing files to device Windows...
[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: MissingPluginException(No implementation found for method listDevices on channel usb_serial)
#0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:313:7)
<asynchronous suspension>
#1      UsbSerial.listDevices (package:usb_serial/usb_serial.dart:444:29)
<asynchronous suspension>
#2      _MyAppState._getPorts (package:usb_serial_example/main.dart:85:31)
<asynchronous suspension>


======== Exception caught by services library ======================================================
The following MissingPluginException was thrown while activating platform stream on channel usb_serial/usb_events:
MissingPluginException(No implementation found for method listen on channel usb_serial/usb_events)

When the exception was thrown, this was the stack: 
#0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:313:7)
<asynchronous suspension>
#1      EventChannel.receiveBroadcastStream.<anonymous closure> (package:flutter/src/services/platform_channel.dart:657:9)
<asynchronous suspension>
====================================================================================================
Lost connection to device.

該当のソースコード

main.dart
1import 'dart:async';
2import 'dart:typed_data';
3
4import 'package:flutter/material.dart';
5import 'package:usb_serial/transaction.dart';
6import 'package:usb_serial/usb_serial.dart';
7
8void main() => runApp(MyApp());
9
10class MyApp extends StatefulWidget {
11  @override
12  _MyAppState createState() => _MyAppState();
13}
14
15class _MyAppState extends State<MyApp> {
16  UsbPort? _port;
17  String _status = "Idle";
18  List<Widget> _ports = [];
19  List<Widget> _serialData = [];
20
21  StreamSubscription<String>? _subscription;
22  Transaction<String>? _transaction;
23  UsbDevice? _device;
24
25  TextEditingController _textController = TextEditingController();
26
27  Future<bool> _connectTo(device) async {
28    _serialData.clear();
29
30    if (_subscription != null) {
31      _subscription!.cancel();
32      _subscription = null;
33    }
34
35    if (_transaction != null) {
36      _transaction!.dispose();
37      _transaction = null;
38    }
39
40    if (_port != null) {
41      _port!.close();
42      _port = null;
43    }
44
45    if (device == null) {
46      _device = null;
47      setState(() {
48        _status = "Disconnected";
49      });
50      return true;
51    }
52
53    _port = await device.create();
54    if (await (_port!.open()) != true) {
55      setState(() {
56        _status = "Failed to open port";
57      });
58      return false;
59    }
60    _device = device;
61
62    await _port!.setDTR(true);
63    await _port!.setRTS(true);
64    await _port!.setPortParameters(115200, UsbPort.DATABITS_8, UsbPort.STOPBITS_1, UsbPort.PARITY_NONE);
65
66    _transaction = Transaction.stringTerminated(_port!.inputStream as Stream<Uint8List>, Uint8List.fromList([13, 10]));
67
68    _subscription = _transaction!.stream.listen((String line) {
69      setState(() {
70        _serialData.add(Text(line));
71        if (_serialData.length > 20) {
72          _serialData.removeAt(0);
73        }
74      });
75    });
76
77    setState(() {
78      _status = "Connected";
79    });
80    return true;
81  }
82
83  void _getPorts() async {
84    _ports = [];
85    List<UsbDevice> devices = await UsbSerial.listDevices();
86    if (!devices.contains(_device)) {
87      _connectTo(null);
88    }
89    print(devices);
90
91    devices.forEach((device) {
92      _ports.add(ListTile(
93          leading: Icon(Icons.usb),
94          title: Text(device.productName!),
95          subtitle: Text(device.manufacturerName!),
96          trailing: ElevatedButton(
97            child: Text(_device == device ? "Disconnect" : "Connect"),
98            onPressed: () {
99              _connectTo(_device == device ? null : device).then((res) {
100                _getPorts();
101              });
102            },
103          )));
104    });
105
106    setState(() {
107      print(_ports);
108    });
109  }
110
111  @override
112  void initState() {
113    super.initState();
114
115    UsbSerial.usbEventStream!.listen((UsbEvent event) {
116      _getPorts();
117    });
118
119    _getPorts();
120  }
121
122  @override
123  void dispose() {
124    super.dispose();
125    _connectTo(null);
126  }
127
128  @override
129  Widget build(BuildContext context) {
130    return MaterialApp(
131        home: Scaffold(
132          appBar: AppBar(
133            title: const Text('USB Serial Plugin example app'),
134          ),
135          body: Center(
136              child: Column(children: <Widget>[
137                Text(_ports.length > 0 ? "Available Serial Ports" : "No serial devices available", style: Theme.of(context).textTheme.headline6),
138                ..._ports,
139                Text('Status: $_status\n'),
140                Text('info: ${_port.toString()}\n'),
141                ListTile(
142                  title: TextField(
143                    controller: _textController,
144                    decoration: InputDecoration(
145                      border: OutlineInputBorder(),
146                      labelText: 'Text To Send',
147                    ),
148                  ),
149                  trailing: ElevatedButton(
150                    child: Text("Send"),
151                    onPressed: _port == null
152                        ? null
153                        : () async {
154                      if (_port == null) {
155                        return;
156                      }
157                      String data = _textController.text + "\r\n";
158                      await _port!.write(Uint8List.fromList(data.codeUnits));
159                      _textController.text = "";
160                    },
161                  ),
162                ),
163                Text("Result Data", style: Theme.of(context).textTheme.headline6),
164                ..._serialData,
165              ])),
166        ));
167  }
168}

pubspec.yaml
1name: usb_serial_example
2description: Demonstrates how to use the usb_serial plugin.
3
4# The following line prevents the package from being accidentally published to
5# pub.dev using `pub publish`. This is preferred for private packages.
6publish_to: 'none' # Remove this line if you wish to publish to pub.dev
7
8# The following defines the version and build number for your application.
9# A version number is three numbers separated by dots, like 1.2.43
10# followed by an optional build number separated by a +.
11# Both the version and the builder number may be overridden in flutter
12# build by specifying --build-name and --build-number, respectively.
13# In Android, build-name is used as versionName while build-number used as versionCode.
14# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
15# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
16# Read more about iOS versioning at
17# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
18version: 1.0.0+1
19
20environment:
21  sdk: '>=2.12.0 <3.0.0'
22
23dependencies:
24  flutter:
25    sdk: flutter
26  async: ^2.5.0
27
28
29
30  # The following adds the Cupertino Icons font to your application.
31  # Use with the CupertinoIcons class for iOS style icons.
32  cupertino_icons: ^1.0.3
33  usb_serial: ^0.4.0
34
35dev_dependencies:
36  flutter_test:
37    sdk: flutter
38
39  usb_serial: ^0.4.0
40# For information on the generic Dart part of this file, see the
41# following page: https://dart.dev/tools/pub/pubspec
42
43# The following section is specific to Flutter.
44flutter:
45
46  # The following line ensures that the Material Icons font is
47  # included with your application, so that you can use the icons in
48  # the material Icons class.
49  uses-material-design: true
50
51  # To add assets to your application, add an assets section, like this:
52  # assets:
53  #   - images/a_dot_burr.jpeg
54  #   - images/a_dot_ham.jpeg
55
56  # An image asset can refer to one or more resolution-specific "variants", see
57  # https://flutter.dev/assets-and-images/#resolution-aware.
58
59  # For details regarding adding assets from package dependencies, see
60  # https://flutter.dev/assets-and-images/#from-packages
61
62  # To add custom fonts to your application, add a fonts section here,
63  # in this "flutter" section. Each entry in this list should have a
64  # "family" key with the font family name, and a "fonts" key with a
65  # list giving the asset and other descriptors for the font. For
66  # example:
67  # fonts:
68  #   - family: Schyler
69  #     fonts:
70  #       - asset: fonts/Schyler-Regular.ttf
71  #       - asset: fonts/Schyler-Italic.ttf
72  #         style: italic
73  #   - family: Trajan Pro
74  #     fonts:
75  #       - asset: fonts/TrajanPro.ttf
76  #       - asset: fonts/TrajanPro_Bold.ttf
77  #         weight: 700
78  #
79  # For details regarding fonts from package dependencies,
80  # see https://flutter.dev/custom-fonts/#from-packages