Hello! When I try to build, I get this error:

Your current kotlinx.serialization core version is too low, while current Kotlin compiler plugin 1.4.0 requires at least 1.0-M1-SNAPSHOT. Please update your kotlinx.serialization runtime dependency.

The problem is, I never updated to Kotlin 1.4. My Kotlin used for dependencies is 1.3.70. I did came across a warning yesterday that sais something like:

Common module has an external compiler that use Kotlin 1.4

Does that ring a bell to someone? The “only” thing I did was to update from gradle 5.6.X to 6.5, but I doubt it had that kind of repercussion. Thanks 🙂

Is this a Gradle build or does the IDE build it without Gradle?

Gradle build

That’s weird then.

kotlin("multiplatform") version "1.3.72"

shouldn’t use a 1.4 compiler 😅

I do not explicitly set version for multiplatform plugin because I have this error:

Plugin request for plugin already on the classpath must not include a version

And this is my root dependencies:

dependencies {
        classpath(Deps.android_gradle_plugin)
        classpath("org.jetbrains.kotlin:kotlin-serialization:${Versions.kotlin}")

        classpath(kotlin("gradle-plugin", Versions.kotlin))
        classpath(Deps.buildKonfig)

        classpath(Deps.Google.services)
    }

Versions.kotlin

it should be then. But

Deps.buildKonfig

may upgrade it transitively to 1.4.0?

Thanks for the tip!

Versions.kotlin

point to 1.3.70 so it shouldn’t be that. But maybe

buildKonfig