Flutter集成fluwx编译出错:compileReleaseKotlin

Running Gradle task 'assembleRelease'...
e: /Users/ado/my/dev_tools/flutter/.pub-cache/hosted/pub.flutter-io.cn/fluwx_no_pay-2.5.2/android/src/main/kotlin/com/jarvan/fluwx/handlers/FluwxRequestHandler.kt: (54, 52): Expecting an argument
FAILURE: Build failed with an exception.                                                                                                                        
* What went wrong:                                                             
*  Execution failed for task ':fluwx_no_pay:compileReleaseKotlin'.                 
> 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

buildscript {
    // ext.kotlin_version = '1.3.50'
    ext.kotlin_version = '1.4.20'
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}