how to solve this error i am stucking on this issue from 7 days

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e: file:///C:/Users/hp/AppData/Local/Pub/Cache/hosted/pub.dev/flutter_web_auth_2-3.1.2/android/src/main/kotlin/com/linusu/flutter_web_auth_2/FlutterWebAuth2Plugin.kt:15:48 Unresolved reference: Registrar
e: file:///C:/Users/hp/AppData/Local/Pub/Cache/hosted/pub.dev/flutter_web_auth_2-3.1.2/android/src/main/kotlin/com/linusu/flutter_web_auth_2/FlutterWebAuth2Plugin.kt:21:5 This annotation is not applicable to target 'class'

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':flutter_web_auth_2:compileDebugKotlin'.
> A failure occurred while executing org.jetbrains.kotlin.compilerRunner.GradleCompilerRunnerWithWorkers$GradleKotlinCompilerWorkAction
> 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 2s
Error: Gradle task assembleDebug failed with exit code 1

Start with android/src/main/kotlin/com/linusu/flutter_web_auth_2/FlutterWebAuth2Plugin.kt and the :flutter_web_auth_2:compileDebugKotlin task mentioned in the report. Reproduce the build failure and investigate the unresolved Registrar reference and annotation error; done means the Gradle assembleDebug build completes successfully.

Written by the indexing model from the issue text.