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Does this also happen if you target 1.7?

Thanks for your reply. Ive run

./gradlew --stop

-> clean -> build. No luck. same error message

Maybe if you do a

./gradlew clean

?

Still no luck

I would try deleting your

build

directories, maybe there's something that clean isn't getting.

Or maybe you use some libraries that require Kotlin 1.8 also in your main branch now? What is the whole error message, doesn't it tell who / what exactly is the problem?

I should mention that i also recloned the repo and still getting the same message

Maybe if you wipe out the caches in

<GRADLE_USER_HOME>

? Everything that is not put manually there like

gradle.properties

or init scripts.

that the full message:

e: /Users/roi/Git/project/src/test/kotlin/MyClass.kt: (155, 56): Class 'kotlin.Unit' was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.8.0, expected version is 1.6.0.
The class is loaded from /Users/roi/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.8.0/1796921c7a3e2e2665a83e6c8d33399336cd39bc/kotlin-stdlib-1.8.0.jar!/kotlin/Unit.class

Oh, ok, that's the Kotlin stdlib, not your classes. Do you get that when compiling through Gradle or when compiling through IDE?

Im running the build task in the intellij gradle bar

Well, you need to find out why kotlin-stdlib makes it into your compile classpath. Something like

./gradlew dependencyInsight --configuration testCompileClasspath --dependency org.jetbrains.kotlin:kotlin-stdlib

should probably help

this is what i get when i do that:

FAILURE: Build failed with an exception.

* What went wrong:
Configuration 'testCompileClasspath' not found in configuration container.

Is it a multi-project build? Call the

dependencyInsight

task on the project where the problem is

thanks! the insight did reveal from where the dependency comes from. Deleting the maven local did the trick.

Yeah, Maven Local is a broken-by-design crap and should be avoided as hell 😄

Noted. Thanks again