正在运行Gradle任务'assembleDebug'... [致命错误] aapt2-3.5.0-5435860.pom：2：1：Prolog中不允许内容

Question

执行flutter doctor命令时没有错误。我尝试用最新版本6.4更新Gradle，并在dist文件夹中的env变量路径中也进行了设置，它也正确显示。

gradle-wrapper.properties

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-6.4-bin.zip

android / app / build.gradle

- compileSdkVersion 28
- targetSdkVersion 28

android / build.gradle

google（）已添加到所有项目和buildscript.repositories

I tried all approaches mentioned in similar kind of queries in StackOverflow and other platforms but of no use, I am totally stuck here.

how to resolve this error?

在错误之后，flutter run命令上显示的信息是

正在运行Gradle任务“ assembleDebug” ...

[Fatal Error] aapt2-3.5.0-5435860.pom:2:1: Content is not allowed in prolog.**
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:mergeDebugResources'.
> Could not resolve all files for configuration ':app:_internal_aapt2_binary'.
   > Could not resolve com.android.tools.build:aapt2:3.5.0-5435860.
     Required by:
         project :app
      > Could not resolve com.android.tools.build:aapt2:3.5.0-5435860.
         > Could not parse POM https://dl.google.com/dl/android/maven2/com/android/tools/build/aapt2/3.5.0-5435860/aapt2-3.5.0-5435860.pom
            > Content is not allowed in prolog.
* 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 6m 22s
Running Gradle task 'assembleDebug'...
Running Gradle task 'assembleDebug'... Done                       401.6s (!)
Exception: Gradle task assembleDebug failed with exit code 1