任务':fluttertoast:compileDebugKotlin'执行失败

1. 我试过 flutter clean
2. flutter pub cache repair,
3. 更改 fluttertoast 包的版本和版本，并删除它，
4. 删除android/.gradle目录并重新构建。

没有任何效果。

Launching libmain.dart on Redmi Note 4 in debug mode...
libmain.dart:1
Parameter format not correct -
e: C:srcflutter.pub-cachehostedpub.dartlang.orgfluttertoast-7.1.8androidsrcmainkotliniogithubponnamkarthiktoastfluttertoastMethodCallHandlerImpl.kt: (45, 84): Unresolved reference: R
e: C:srcflutter.pub-cachehostedpub.dartlang.orgfluttertoast-7.1.8androidsrcmainkotliniogithubponnamkarthiktoastfluttertoastMethodCallHandlerImpl.kt: (70, 68): Unresolved reference: R
e: C:srcflutter.pub-cachehostedpub.dartlang.orgfluttertoast-7.1.8androidsrcmainkotliniogithubponnamkarthiktoastfluttertoastMethodCallHandlerImpl.kt: (85, 64): Unresolved reference: R
2

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':fluttertoast: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 39s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

回答

classpath 'com.android.tools.build:gradle:3.5.4'