[Flutter] Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15.

問題描述：

Android Studio在更新完gradle后，發現demo項目運行出錯了。

報錯有一大串（很多文件），一直在重復說着要我提高gradle版本。

看下報錯信息：

The class is loaded from C:/Users/samsung/.gradle/caches/transforms-3/7ad36a5b116dac2d2ae0e1e5f4e80713/transformed/jetified-kotlin-stdlib-1.5.31.jar!/kotlin/Unit.class
e: D:\Flutter\flutter\.pub-cache\hosted\pub.flutter-io.cn\wakelock-0.6.1+1\android\src\main\kotlin\creativemaybeno\wakelock\WakelockPlugin.kt: (30, 15): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15

.....
.....
.....

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':wakelock:compileDebugKotlin'.
> Compilation error. See log for more details

* 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 1m 20s
[!] Your project requires a newer version of the Kotlin Gradle plugin.
    Find the latest version on https://kotlinlang.org/docs/gradle.html#plugin-and-versions, then update D:\Flutter\Code\flutter_demo\android\build.gradle:
    ext.kotlin_version = '<latest-version>'
Exception: Gradle task assembleDebug failed with exit code 1
　　

其中，從這三句可以看到原因和解決方法：

The class is loaded from C:/Users/samsung/.gradle/caches/transforms-3/7ad36a5b116dac2d2ae0e1e5f4e80713/transformed/jetified-kotlin-stdlib-1.5.31.jar!/kotlin/Unit.class 
The binary version of its metadata is 1.5.1, expected version is 1.1.15.

[!] Your project requires a newer version of the Kotlin Gradle plugin.

update D:\Flutter\Code\flutter_demo\android\build.gradle:

解決方法：

找到項目下的\android\build.gradle文件

修改Kotlin_version為報錯信息中最高的版本，即1.5.31

ext.kotlin_version = '1.5.31'

　

完畢！