Compiler error using webView in flutter: The argument type 'AutoMediaPlaybackPolicy can't be assigned to the parameter type 'AutoMediaPlaybackPolicy - flutter

Question

I'm trying to write an app with the use of the WebView in flutter. However, i'm receiving the error described below:
compiler message:
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/webview_flutter-0.3.22+1/lib/webview_flutter.Dart:395:37: Error: The argument type 'AutoMediaPlaybackPolicy/*1*/' can't be assigned to the parameter type 'AutoMediaPlaybackPolicy/*2*/'.
- 'AutoMediaPlaybackPolicy/*1*/' is from 'package:webview_flutter/webview_flutter.Dart' ('/C:/flutter/.pub-cache/hosted/pub.dartlang.org/webview_flutter-0.3.22+1/lib/webview_flutter.Dart').
- 'AutoMediaPlaybackPolicy/*2*/' is from 'package:webview_flutter/webview_flutter.dart' ('/C:/flutter/.pub-cache/hosted/pub.dartlang.org/webview_flutter-0.3.22+1/lib/webview_flutter.dart').
autoMediaPlaybackPolicy: widget.initialMediaPlaybackPolicy,
^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/webview_flutter-0.3.22+1/lib/webview_flutter.Dart:401:28: Error: The argument type 'JavascriptMode/*1*/' can't be assigned to the parameter type 'JavascriptMode/*2*/'.
- 'JavascriptMode/*1*/' is from 'package:webview_flutter/webview_flutter.Dart' ('/C:/flutter/.pub-cache/hosted/pub.dartlang.org/webview_flutter-0.3.22+1/lib/webview_flutter.Dart').
- 'JavascriptMode/*2*/' is from 'package:webview_flutter/webview_flutter.dart' ('/C:/flutter/.pub-cache/hosted/pub.dartlang.org/webview_flutter-0.3.22+1/lib/webview_flutter.dart').
javascriptMode: widget.javascriptMode,
^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/webview_flutter-0.3.22+1/lib/webview_flutter.Dart:426:31: Error: A value of type 'JavascriptMode/*1*/' can't be assigned to a variable of type 'JavascriptMode/*2*/'.
- 'JavascriptMode/*1*/' is from 'package:webview_flutter/webview_flutter.dart' ('/C:/flutter/.pub-cache/hosted/pub.dartlang.org/webview_flutter-0.3.22+1/lib/webview_flutter.dart').
- 'JavascriptMode/*2*/' is from 'package:webview_flutter/webview_flutter.Dart' ('/C:/flutter/.pub-cache/hosted/pub.dartlang.org/webview_flutter-0.3.22+1/lib/webview_flutter.Dart').
javascriptMode = newValue.javascriptMode;
^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/webview_flutter-0.3.22+1/lib/webview_flutter.Dart:439:21: Error: The argument type 'JavascriptMode/*1*/' can't be assigned to the parameter type 'JavascriptMode/*2*/'.
- 'JavascriptMode/*1*/' is from 'package:webview_flutter/webview_flutter.Dart' ('/C:/flutter/.pub-cache/hosted/pub.dartlang.org/webview_flutter-0.3.22+1/lib/webview_flutter.Dart').
- 'JavascriptMode/*2*/' is from 'package:webview_flutter/webview_flutter.dart' ('/C:/flutter/.pub-cache/hosted/pub.dartlang.org/webview_flutter-0.3.22+1/lib/webview_flutter.dart').
javascriptMode: javascriptMode,
I created a separate app only using WebView (to test my environment) and that's running correctly. I don't understand because in the first application (with error) presents the issue. If I remove all code related to WebView the compiler message still the same, i.e, the problem happens when I do the import in the package. The pubspec.yaml is identical in the two Applications.
The respective code:
import 'package:webview_flutter/webview_flutter.Dart';
class WebViewContainer extends StatefulWidget {
final url;
WebViewContainer(this.url);
#override
createState() => _WebViewContainerState(this.url);
}
class _WebViewContainerState extends State<WebViewContainer> {
var _url;
final _key = UniqueKey();
_WebViewContainerState(this._url);
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: Column(
children: [
Expanded(
child: WebView(
key: _key,
javascriptMode: JavascriptMode.unrestricted,
initialUrl: _url))
],
));
}
}
The piece of code where the action happens:
class CursoDeNoivos extends StatelessWidget{
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Curso de Noivos"),
centerTitle: true,
backgroundColor: Colors.deepPurple,
),
body:SingleChildScrollView(
child: Column(
children: <Widget>[
Expanded(
child: Padding(
padding: EdgeInsets.only(left: 1.0, top: 1.0, right: 1.0, bottom: 1.0),
child: Container(
height: button_height,
child: buildIconButton("Inscrições", _insc, context, Icons.add_circle_outline),
)
),
)
],
The action when the button is pressed:
Widget buildIconButton(String _text, Object _obj, BuildContext _context, IconData _icon) {
return RaisedButton.icon(
onPressed: (){
//Navigator.push(_context, MaterialPageRoute(builder: (context) => _obj));
Navigator.push(_context, MaterialPageRoute(builder: (context) => WebViewContainer('https://google.com')));
},
icon: Icon(_icon, color: Colors.white, size: 30.0,),
label: Text(_text, style: TextStyle(color: Colors.white, fontSize: 20), textAlign: TextAlign.left),
color: Colors.deepPurple,
);
}
The pubspec.yaml file:
# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev
# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1
environment:
sdk: ">=2.7.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^0.1.3
webview_flutter: ^0.3.3
dev_dependencies:
flutter_test:
sdk: flutter
# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec
# The following section is specific to Flutter.
flutter:
# The following line ensures that the Material Icons font is
# included with your application, so that you can use the icons in
# the material Icons class.
uses-material-design: true
assets:
- images/casados.jpg
- images/noivos.jpg
The Flutter doctor results:
C:\flutter\bin\flutter.bat doctor --verbose
[√] Flutter (Channel beta, v1.17.0, on Microsoft Windows [versão 10.0.18362.836], locale pt-BR)
• Flutter version 1.17.0 at C:\flutter
• Framework revision e6b34c2b5c (4 weeks ago), 2020-05-02 11:39:18 -0700
• Engine revision 540786dd51
• Dart version 2.8.1
[√] Android toolchain - develop for Android devices (Android SDK version 30.0.0-rc4)
• Android SDK at C:\Users\feps\AppData\Local\Android\sdk
• Platform android-29, build-tools 30.0.0-rc4
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
• All Android licenses accepted.
[√] Android Studio (version 3.6)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 45.1.1
• Dart plugin version 192.7761
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
[√] VS Code, 64-bit edition (version 1.24.0)
• VS Code at C:\Program Files\Microsoft VS Code
• Flutter extension version 2.21.1
[√] Connected device (1 available)
• Android SDK built for x86 • emulator-5554 • android-x86 • Android 9 (API 28) (emulator)
• No issues found!
Process finished with exit code 0
I've got no idea about the cause of the issue...
(I'm new in Flutter or Apps development)