我最近下载了android studio，打开了一个现成的应用程序并尝试启动它，但没有成功。我不知道为什么，我是一个初学者，但我按照应用程序卖家的指示做了一切，一切都配置正确。谢谢
错误代码：
Launching libmain.dart on MI 8 Lite 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/addon2/03 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/repository2/03 to old ns http://schemas.android.com/sdk/android/repo/repository2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/sys-img2/03 to old ns http://schemas.android.com/sdk/android/repo/sys-img2/01
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
Warning: unexpected element (uri:"", local:"base-extension"). Expected elements are <{}codename>,<{}layoutlib>,<{}api-level>
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/platform-3.0.0/lib/src/interface/local_platform.dart:46:19: Error: Member not found: 'packageRoot'.
io.Platform.packageRoot; // ignore: deprecated_member_use
^^^^^^^^^^^
FAILURE: Build failed with an exception.
* Where:
Script 'C:srcflutterpackagesflutter_toolsgradleflutter.gradle' line: 1102
* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'C:srcflutterbinflutter.bat'' finished with non-zero exit value 1
* 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 40s
Exception: Gradle task assembleDebug failed with exit code 1
从您的代码中可以看出，您正在尝试运行Flutter应用程序，这是一个跨平台的框架。你需要从安卓工作室的插件部分安装Flutter软件包，然后再次尝试运行该应用程序。