错误：

Exception: [!] Your app is using an unsupported Gradle project. To fix this problem, create a new project by running `flutter create -t app <app-directory>` and then move the dart code, assets and pubspec.yaml to the new project.

你好！我必须更新Flutter项目从Flutterv1到Flutterv3。在代码和库更新之前，我需要重新启动这个旧项目。在iOS上它工作，但在Android上我得到这个错误。我在wrapper属性中有这个特定的gradle版本：distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-all.zip;然后这是我的build.gradle（在android文件夹下）：

buildscript {
    ext.kotlin_version = '1.3.50'
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.8'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

然后看起来很奇怪，src文件夹下没有build.gradle文件，应该定义minSdkVersion，targetSdkVersion，插件等。这是我的扑动医生输出：

[✓] Flutter (Channel beta, 1.24.0-10.2.pre, on macOS 13.3 22E252 darwin-arm, locale it-IT)
    • Flutter version 1.24.0-10.2.pre at /Users/alessandro_cancelliere/fvm/versions/1.24.0-10.2.pre
    • Framework revision 022b333a08 (2 years, 7 months ago), 2020-11-18 11:35:09 -0800
    • Engine revision 07c1eed46b
    • Dart version 2.12.0 (build 2.12.0-29.10.beta)

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at /Users/alessandro_cancelliere/Library/Android/sdk
    • Platform android-34, build-tools 34.0.0
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 14.3)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 14.3, Build version 14E222b
    • CocoaPods version 1.12.1

[✓] Android Studio (version 2022.2)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)

[✓] IntelliJ IDEA Ultimate Edition (version 2021.1)
    • IntelliJ at /Applications/IntelliJ IDEA.app
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart

[✓] VS Code (version 1.79.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.67.20230601

我已经尝试了很多解决方案，正如这篇文章建议的https://stackoverflow.com/questions/62064188/exception-your-app-is-using-an-unsupported-gradle-project，我也尝试了不同版本的Java，但都没有成功。