Don't use 'BuildContext's across async gaps.
Try rewriting the code to not use the 'BuildContext', or guard the use with a 'mounted' check.

ERROR:D8: com.android.tools.r8.kotlin.H

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:mergeExtDexDebug'.
> Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
   > Failed to transform kotlin-stdlib-1.9.22.jar (org.jetbrains.kotlin:kotlin-stdlib:1.9.22) to match attributes {artifactType=android-dex, asm-transformed-variant=NONE, dexing-enable-desugaring=true, dexing-enable-jacoco-instrumentation=false, dexing-is-debuggable=true, dexing-min-sdk=21, org.gradle.category=library, org.gradle.jvm.environment=standard-jvm, org.gradle.libraryelements=jar, org.gradle.status=release, org.gradle.usage=java-runtime, org.jetbrains.kotlin.platform.type=jvm}.
      > Execution failed for DexingWithClasspathTransform: C:\Users\servi\.gradle\caches\transforms-3\1983f727e0b09deaaac883df8ca9a0fb\transformed\jetified-kotlin-stdlib-1.9.22.jar.
         > Error while dexing.

e: Incompatible classes were found in dependencies. Remove them from the classpath or use '-Xskip-metadata-version-check' to suppress errors
e: C:/Users/servi/.gradle/caches/transforms-3/c5aeee160e24da9691489e5d4b8fd60d/transformed/jetified-kotlin-stdlib-1.9.22.jar!/META-INF/kotlin-stdlib-jdk7.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.7.1.

flutter windows error MSB3073

Nuget.exe not found, trying to download or use cached version

C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: "C:\Program Files\Microsoft Visual Studio\2022\Community\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe" -DBUILD_TYPE=Debug -P cmake_install.cmake [D:\Projects\Flutter-apps\cbes_buyer_app\build\windows\x64\INSTALL.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: if %errorlevel% neq 0 goto :cmEnd [D:\Projects\Flutter-apps\cbes_buyer_app\build\windows\x64\INSTALL.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: :cmEnd [D:\Projects\Flutter-apps\cbes_buyer_app\build\windows\x64\INSTALL.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: endlocal & call :cmErrorLevel %errorlevel% & goto :cmDone [D:\Projects\Flutter-apps\cbes_buyer_app\build\windows\x64\INSTALL.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: :cmErrorLevel [D:\Projects\Flutter-apps\cbes_buyer_app\build\windows\x64\INSTALL.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: exit /b %1 [D:\Projects\Flutter-apps\cbes_buyer_app\build\windows\x64\INSTALL.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: :cmDone [D:\Projects\Flutter-apps\cbes_buyer_app\build\windows\x64\INSTALL.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: if %errorlevel% neq 0 goto :VCEnd [D:\Projects\Flutter-apps\cbes_buyer_app\build\windows\x64\INSTALL.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(166,5): error MSB3073: :VCEnd”已退出，代码为 1。 [D:\Projects\Flutter-apps\cbes_buyer_app\build\windows\x64\INSTALL.vcxproj]
Error: Build process failed.

download nuget from official ,then put it in the path where system can find it,

restart ide, flutter clean ,then build again

CMake Error at flutter/ephemeral/.plugin_symlinks/permission_handler_windows/windows/CMakeLists.txt:29 (message):
  Failed to install nuget package Microsoft.Windows.CppWinRT.2.0.210806.1
2

Error: Unable to generate build files