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kotlinlang

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 :slightly_smiling_face:

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

That’s weird then. `kotlin("multiplatform") version "1.3.72"` shouldn’t use a 1.4 compiler :sweat_smile:

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?

You could use a `./gradlew build --scan` to create a build scan and then explore the build dependencies on the web to see what dependency causes the upgrade to 1.4.0

Thanks for the tip!

`Versions.kotlin`  point to 1.3.70 so it shouldn’t be that. But maybe `buildKonfig`

Well, that `buildKonfig`  was causing problem :sweat_smile: Thanks for the help!