Kotlin gradle Could not initialize class org.jetbrains.kotlin.gradle.internal.KotlinSourceSetProviderImplKt

I tried to use gradle for transpiling Kotlin to Js. When I run the example from https://www.codeflow.site/fr/article/kotlin-javascript I got the error : Could not initialize class org.jetbrains.kotlin.gradle.internal.KotlinSourceSetProviderImplKt which comes from line apply plugin: 'kotlin2js' of build.gradle.

I have no idea of what the missing class is and why kotlin2js is asking for it. Any suggestion ?

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I just had the same issue. On windows, I checked the kotlin version from the command line with gradle -v and then adjusted the kotlin version in build.gradle of my project to match my version of gradle.

I hope this works for you too.

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It seems it is a problem with different Ktlin verion as explained in Building Kotlin projects with Gradle sometimes fails with NoClassDefFoundError

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Solved this issue by setting the latest Kotlin version (1.3.72) in build.gradle file.

buildscript {
ext {
kotlinVersion = '1.4.20'
springBootVersion = '2.0.4.RELEASE'
}
repositories {
mavenCentral()
}
...
}
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In my case this solves the problem:

buildscript {
ext.kotlin_version = "1.3.72"
repositories {
google()
jcenter()
        

}
dependencies {
classpath 'com.android.tools.build:gradle:4.0.0'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        

}
}

Set ext.kotlin_version = "1.3.72" and $kotlin_version

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I don't know if I can do the same as KP7984 said - to check the versions of the plugins of my Android Studio, not the ones of my OS. I use gradlew -v of my project instead of gradle -v and it works for me.

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update your Version in your gradle.properties file. eg) kotlinVersion=1.3.72

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In Android Studio: File -> Project Structure -> Variables

There edit the kotlin_version to e.g. 1.3.72

Gradle should resync automatically, otherwise resync manually

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In your build.gradle file if you hover over the classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" it will tell you what version of Kotlin you will have to use in the kotlinVersion variable at the top of the file, according to your SDK/plugins versions.

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Yes, as many before have said, the problem is probably that you have a kotlin version mis-match. But how do you know what version of kotlin is installed?

To find out your version of kotlin: Settings -> Language & Frameworks -> Kotlin

picture of settings

Make sure that you change your kotlin version (in both build.gradle files!) to this exact number. In my case (above) it's 1.4.10

Good luck!

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Simplest solution:

Go to file -> project structure (ctrl+shift+alt+s) -> suggestions -> accept all the suggestions.

To answer the OP's quetion, you just need to accept the one with the kotlin version


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