Warning: Mapping new ns to old ns and emulator stopping abruptly - flutter

Question

After upgrading to Arctic Fox , I am getting the following errors, even though the emulator is running but sometimes stopping abruptly.
What is this error ?
How can I get rid of this ?
I am using the following as copied from cmd :
> C:\Users\Debasis>flutter doctor Doctor summary (to see all details,
> run flutter doctor -v): [√] Flutter (Channel stable, 2.2.3, on
> Microsoft Windows [Version 10.0.19042.1165], locale en-IN) [√] Android
> toolchain - develop for Android devices (Android SDK version 31.0.0)
> [√] Chrome - develop for the web [√] Android Studio [√] Connected
> device (2 available)
• No issues found!
The Error :
Launching lib\main.dart on sdk gphone x86 in debug mode... Running
Gradle task 'assembleDebug'... Warning: Mapping new ns
http://schemas.android.com/repository/android/common/02 to old ns
http://schemas.android.com/repository/android/common/01 Warning:
Mapping new ns
http://schemas.android.com/repository/android/generic/02 to old ns
http://schemas.android.com/repository/android/generic/01 Warning:
Mapping new ns http://schemas.android.com/sdk/android/repo/addon2/02
to old ns http://schemas.android.com/sdk/android/repo/addon2/01
Warning: Mapping new ns
http://schemas.android.com/sdk/android/repo/repository2/02 to old ns
http://schemas.android.com/sdk/android/repo/repository2/01 Warning:
Mapping new ns http://schemas.android.com/sdk/android/repo/sys-img2/02
to old ns http://schemas.android.com/sdk/android/repo/sys-img2/01 √
Built build\app\outputs\flutter-apk\app-debug.apk. Installing
build\app\outputs\flutter-apk\app.apk... Debug service listening on
ws://127.0.0.1:57467/XzCZTOeqyQs=/ws Syncing files to device sdk
gphone x86...

Answer 1

I had a similar issue. Two things did the trick for me.
Updated the gradle version in my gradle-wrapper.properties file to the latest available version
Updated the gradle plugin version in my /android/build.gradle file to the latest available version
gradle-wrapper.properties
distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-all.zip
/android/build.gradle
dependencies {
classpath 'com.android.tools.build:gradle:7.0.4'
}
Give these a try and see if it works!

Answer 2

I have also the same problem, when I was updated android studio. i research to fix that issue,
TODO ;
step 1 : GOTO project Folder
/android/build.gradle
to update a latest gradle version in dependencies.
dependencies {
classpath 'com.android.tools.build:gradle:7.0.2'
}
step 2 :
/android/gradle/wrapper/gradle-wrapper.properties
here also to update a latest version of gradle
distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-all.zip
step 3: go to terminal and run flutter clean
step 4: and run flutter pub get
step 5: and run your project using flutter run command
one more think but that issue fix that project only. if u know fix that issue permanently please let me know,

Answer 3

I got the same problem, but after quick research, I managed to solve the problem.
step 1: Go to this webpage: Android Gradle plugin
step 2: Copy the build.gradle plugin to version
step 3: Go to your flutter app project and open the "build.gradle" file under
your_project>android
step 4: In that file edit dependencies.
classpath 'com.android.tools.build:gradle:<step 2 copied version>'
step 5: Now re-run your flutter app. You might see a new error, showing
A problem occurred evaluating project ':app'.
Failed to apply plugin 'com.android.internal.version-check'.
Now follow the instructions given in that error. (highlighted area in the image)