KotlinSourceSet with name 'unixMain' not found.

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plugins {
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    kotlin("multiplatform")
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}
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group = "tech.eritquearcus"
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version = 0.0.0.0
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kotlin {
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    jvm {
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        compilations.all {
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            kotlinOptions.jvmTarget = "1.8"
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        }
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        withJava()
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        testRuns["test"].executionTask.configure {
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            useJUnitPlatform()
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        }
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    }
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    val hostOs = System.getProperty("os.name")
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    val isMingwX64 = hostOs.startsWith("Windows")
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    val nativeTarget = when {
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        hostOs == "Mac OS X" -> macosX64("unix")
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        hostOs == "Linux" -> linuxX64("unix")
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        isMingwX64 -> mingwX64("win")
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        else -> throw GradleException("Host OS is not supported in Kotlin/Native.")
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    }
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    sourceSets {
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        val commonMain by getting {
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            dependencies {
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            }
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            apply(plugin = "org.jetbrains.kotlin.plugin.serialization")
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        }
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        val jvmMain by getting
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        val unixMain by getting
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        val winMain by getting
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    }
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}

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KotlinSourceSet with name 'unixMain' not found.
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* Try:
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> Run with --info or --debug option to get more log output.
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> Run with --scan to get full insights.
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* Exception is:
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org.gradle.api.UnknownDomainObjectException: KotlinSourceSet with name 'unixMain' not found.
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  at org.gradle.api.internal.DefaultNamedDomainObjectCollection.createNotFoundException(DefaultNamedDomainObjectCollection.java:504)
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  at org.gradle.api.internal.DefaultNamedDomainObjectCollection.getByName(DefaultNamedDomainObjectCollection.java:333)
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  at org.gradle.kotlin.dsl.NamedDomainObjectCollectionDelegateProvider.provideDelegate(NamedDomainObjectCollectionExtensions.kt:384)
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  at Build_gradle$1$2.execute(build.gradle.kts:53)
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  at Build_gradle$1$2.execute(build.gradle.kts:1)
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    ...

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    val unixMain = maybeCreate("unixMain").apply {
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        this.dependsOn(commonMain)
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    }
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    val winMain = maybeCreate("winMain").apply {
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        this.dependsOn(commonMain)
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    }

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    val unixMain by getting
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    val winMain by getting