我已经安装了完整的颤振设置，颤振医生没有显示任何错误。Flutter web 工作得非常好，但是当我尝试构建一个 apk 时，它会显示这个错误
Launching lib\main.dart on M2007J20CG in debug mode...
lib\main.dart:1
[Fatal Error] gson-2.8.5.pom:2:1: Content is not allowed in prolog.
[Fatal Error] kotlin-reflect-1.3.72.pom:2:1: Content is not allowed in prolog.
[Fatal Error] kotlin-stdlib-1.3.72.pom:2:1: Content is not allowed in prolog.
[Fatal Error] jsr305-1.3.9.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 org.jetbrains.kotlin:kotlin-reflect:1.3.72.
Required by:
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50 > org.jetbrains.kotlin:kotlin-compiler-embeddable:1.3.50
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50 > org.jetbrains.kotlin:kotlin-compiler-runner:1.3.50 > org.jetbrains.kotlin:kotlin-daemon-client:1.3.50
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50 > org.jetbrains.kotlin:kotlin-scripting-compiler-impl-embeddable:1.3.50 > org.jetbrains.kotlin:kotlin-scripting-common:1.3.50
> Could not resolve org.jetbrains.kotlin:kotlin-reflect:1.3.72.
> Could not parse POM https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-reflect/1.3.72/kotlin-reflect-1.3.72.pom
> Content is not allowed in prolog.
> Could not resolve org.jetbrains.kotlin:kotlin-stdlib:1.3.72.
Required by:
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50 > org.jetbrains.kotlin:kotlin-compiler-embeddable:1.3.50
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50 > org.jetbrains.kotlin:kotlin-annotation-processing-gradle:1.3.50
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50 > org.jetbrains.kotlin:kotlin-scripting-compiler-embeddable:1.3.50
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50 > org.jetbrains.kotlin:kotlin-scripting-compiler-impl-embeddable:1.3.50
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50 > org.jetbrains.kotlin:kotlin-gradle-plugin-api:1.3.50
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50 > org.jetbrains.kotlin:kotlin-gradle-plugin-model:1.3.50
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50 > org.jetbrains.kotlin:kotlin-native-utils:1.3.50
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50 > org.jetbrains.kotlin:kotlin-scripting-compiler-impl-embeddable:1.3.50 > org.jetbrains.kotlin:kotlin-scripting-common:1.3.50
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50 > org.jetbrains.kotlin:kotlin-scripting-compiler-impl-embeddable:1.3.50 > org.jetbrains.kotlin:kotlin-scripting-jvm:1.3.50
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50 > org.jetbrains.kotlin:kotlin-native-utils:1.3.50 > org.jetbrains.kotlin:kotlin-util-io:1.3.50
> Could not resolve org.jetbrains.kotlin:kotlin-stdlib:1.3.72.
> Could not parse POM https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-stdlib/1.3.72/kotlin-stdlib-1.3.72.pom
> Content is not allowed in prolog.
> Could not resolve com.google.code.gson:gson:2.8.5.
Required by:
project : > org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50
project : > com.android.tools.build:gradle:4.1.0 > androidx.databinding:databinding-compiler-common:4.1.0
project : > com.android.tools.build:gradle:4.1.0 > com.google.protobuf:protobuf-java-util:3.10.0
project : > com.android.tools.build:gradle:4.1.0 > com.android.tools.build:builder:4.1.0 > com.android.tools:sdklib:27.1.0
project : > com.android.tools.build:gradle:4.1.0 > com.android.tools.build:builder:4.1.0 > com.android.tools.build:manifest-merger:27.1.0
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 > com.android.tools.analytics-library:shared:27.1.0
> Could not resolve com.google.code.gson:gson:2.8.5.
> Could not parse POM https://repo.maven.apache.org/maven2/com/google/code/gson/gson/2.8.5/gson-2.8.5.pom
> Content is not allowed in prolog.
> Could not resolve org.jetbrains.kotlin:kotlin-reflect:1.3.72.
Required by:
project : > com.android.tools.build:gradle:4.1.0 > com.android.tools.lint:lint-gradle-api:27.1.0
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 org.jetbrains.kotlin:kotlin-reflect:1.3.72.
> Could not parse POM https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-reflect/1.3.72/kotlin-reflect-1.3.72.pom
> Content is not allowed in prolog.
> Could not resolve org.jetbrains.kotlin:kotlin-stdlib:1.3.72.
Required by:
project : > com.android.tools.build:gradle:4.1.0 > org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.72
project : > com.android.tools.build:gradle:4.1.0 > org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.72 > org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.72
> Could not resolve org.jetbrains.kotlin:kotlin-stdlib:1.3.72.
> Could not parse POM https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-stdlib/1.3.72/kotlin-stdlib-1.3.72.pom
> Content is not allowed in prolog.
> Could not resolve com.google.code.gson:gson:2.8.5.
Required by:
project : > com.android.tools.build:gradle:4.1.0 > com.android.tools.build.jetifier:jetifier-core:1.0.0-beta09
> Could not resolve com.google.code.gson:gson:2.8.5.
> Could not parse POM https://repo.maven.apache.org/maven2/com/google/code/gson/gson/2.8.5/gson-2.8.5.pom
> Content is not allowed in prolog.
> Could not resolve org.jetbrains.kotlin:kotlin-stdlib:1.3.72.
Required by:
project : > com.android.tools.build:gradle:4.1.0 > com.android.tools.build.jetifier:jetifier-core:1.0.0-beta09
project : > com.android.tools.build:gradle:4.1.0 > com.android.tools.build.jetifier:jetifier-processor:1.0.0-beta09
> Could not resolve org.jetbrains.kotlin:kotlin-stdlib:1.3.72.
> Could not parse POM https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-stdlib/1.3.72/kotlin-stdlib-1.3.72.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 7s
Exception: Gradle task assemble Debug failed with exit code 1
谁能帮我吗。我正在尝试修复它，已经 3 天了。我不知道我错过了什么，你能帮我或建议我解决它。任何帮助，将不胜感激。