Flutter - Execution failed for task ':app:multiDexListDebug' - flutter

Question

After adding the plugin webview_flutter_plus and after adding this line in android:usesCleartextTraffic="true" in your <project-directory>/android/app/src/main/AndroidManifest.xml under application
and Required Permissions line
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
I am facing the below error. Can anyone help me out to get this fixed?
Error :
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:multiDexListDebug'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade
> Error while merging dex archives:
Learn how to resolve the issue at https://developer.android.com/studio/build/dependencies#duplicate_classes.
Type io.flutter.plugins.webviewflutter.WebViewFlutterPlugin is defined multiple times: C:\Users\Admin\Downloads\flow-0.1-master\build\webview_media\intermediates\runtime_library_classes\debug\classes.jar:io/flutter/plugins/webviewflutter/WebViewFlutterPlugin.class, C:\Users\Admin\Downloads\flow-0.1-master\build\webview_flutter\intermediates\runtime_library_classes\debug\classes.jar:io/flutter/plugins/webviewflutter/WebViewFlutterPlugin.class
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 1m 47s
Exception: Gradle task assembleDebug failed with exit code 1

Answer 1

If your minSdkVersion is set to 21 or higher, multidex is enabled by default and you do not need the multidex support library.
Below 21 API
android {
defaultConfig {
...
minSdkVersion 15
targetSdkVersion 28
multiDexEnabled true
}
...
}
dependencies {
implementation 'com.android.support:multidex:1.0.3' // add latest dependency
}

Answer 2

Have you tried enabling multiDex in android folder -> app folder -> build.gradle file?
defaultConfig {
multiDexEnabled true
}

Answer 3

this happens because the library you are using uses the same dependences.
in my case,i use package
flutter html : 1.0.0
youtube_player_flutter: ^6.1.0
and both packages use the same dependences, namely webview_flutter so that the error is
io.flutter.plugins.webviewflutter.WebViewFlutterPlugin
Solution
in VSCode Search (Ctrl+Shift + P)
in your error io.flutter.plugins.webviewflutter.WebViewFlutterPlugin search for keywords webview.
Find a library that uses the same dependences, then update to the latest package version.(Work for me)
This solution will keep the library you are using without deleting it.
flutter html : 1.0.0
youtube_player_flutter: ^7.0.0