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kotlinlang

Hello, I do not understand why I am getting `unresolved reference` and `Cannot access 'Serializable': it is internal in '<http://kotlin.io|kotlin.io>'` when calling to `import *kotlinx.serialization.**` - I do have:
```plugins {
    alias(libs.plugins.kotlinMultiplatform)
    alias(libs.plugins.androidLibrary)
    kotlin("plugin.serialization") version "1.9.23"
}
dependencies {
    implementation("androidx.core:core-ktx:+")
    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.0")
}```
these in my build.gradle.kts

can anyone advise?

this SO thread suggests i just need the dependency, which I already do:
<https://stackoverflow.com/questions/74366590/intellij-ktor-kotlinx-serialization-cannot-access-serializable-it-is-inter>