Flutter 运行颤振应用程序时出错

我最近在Flitter上制作了一些应用程序来学习它，它们工作得很好。然而，最近当我开始制作另一个应用程序时，我发现了一个问题。在创建项目文件并运行

main.dart

文件之后，我经常会遇到这个错误

Launching lib\main.dart on ONEPLUS A6000 in debug mode...
[Fatal Error] javax.inject-1.pom:2:1: Content is not allowed in prolog.
[Fatal Error] json-simple-1.1.pom:2:1: Content is not allowed in prolog.
[Fatal Error] fastutil-7.2.0.pom:2:1: Content is not allowed in prolog.
[Fatal Error] javawriter-2.5.0.pom:2:1: Content is not allowed in prolog.

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'android'.
> Could not resolve all artifacts for configuration ':classpath'.
   > Could not resolve com.squareup:javawriter:2.5.0.
     Required by:
         project : > com.android.tools.build:gradle:4.1.0 > com.android.tools.build:builder:4.1.0
      > Could not resolve com.squareup:javawriter:2.5.0.
         > Could not parse POM https://jcenter.bintray.com/com/squareup/javawriter/2.5.0/javawriter-2.5.0.pom
            > Content is not allowed in prolog.
   > Could not resolve javax.inject:javax.inject:1.
     Required by:
         project : > com.android.tools.build:gradle:4.1.0 > com.android.tools.build:builder:4.1.0
         project : > com.android.tools.build:gradle:4.1.0 > com.android.tools.build:builder:4.1.0 > com.android.tools:sdk-common:27.1.0
      > Could not resolve javax.inject:javax.inject:1.
         > Could not parse POM https://jcenter.bintray.com/javax/inject/javax.inject/1/javax.inject-1.pom
            > Content is not allowed in prolog.
   > Could not resolve it.unimi.dsi:fastutil:7.2.0.
     Required by:
         project : > com.android.tools.build:gradle:4.1.0 > com.android.tools.build:builder:4.1.0
      > Could not resolve it.unimi.dsi:fastutil:7.2.0.
         > Could not parse POM https://jcenter.bintray.com/it/unimi/dsi/fastutil/7.2.0/fastutil-7.2.0.pom
            > Content is not allowed in prolog.
   > Could not resolve com.googlecode.json-simple:json-simple:1.1.
     Required by:
         project : > com.android.tools.build:gradle:4.1.0 > com.android.tools.build:builder:4.1.0
      > Could not resolve com.googlecode.json-simple:json-simple:1.1.
         > Could not parse POM https://jcenter.bintray.com/com/googlecode/json-simple/json-simple/1.1/json-simple-1.1.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 11s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

我以前的项目仍然在我的手机上运行（当我启动它们的main.dart文件时，它工作得很好），似乎只有我正在创建的新项目遇到了这个问题