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错误1：

FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':audioplayers_android:compileDebugKotlin'. > Inconsistent JVM-target compatibility detected for tasks 'compileDebugJavaWithJavac' (1.8) and 'compileDebugKotlin' (21). Consider using JVM Toolchain: https://kotl.in/gradle/jvm/toolchain Learn more about JVM-target validation: https://kotl.in/gradle/jvm/target-validation

* 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 1s

错误2:

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine the dependencies of task ':audioplayers_android:compileDebugKotlin'.
> Unknown Kotlin JVM target: 21

* 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 1s

解决方案：

1.首先找到依赖项目的路径：

audioplayers: ^4.1.0 存放路径

On Windows:

C:\Users\<Your-Username>\AppData\Local\Pub\Cache\hosted\pub.dev\audioplayers-4.1.0

On macOS/Linux:

~/.pub-cache/hosted/pub.dev/audioplayers-4.1.0

实际我的路径是：~/.pub-cache/hosted/pub.flutter-io.cn/audioplayers-4.1.0

audioplayers-4.1.0对应的依赖：

查看pubspec.yaml中的：

修改同目录下audioplayers_android-3.0.2/android/build.gradle

添加：

android{

...

...

compileOptions {

sourceCompatibility = 21

targetCompatibility = 21

}

kotlinOptions {

jvmTarget = '21'

}

}