I decided to move my build logic into a gradle plugin for deduplication, but when calling `apply<...

# gradle

[martmists]

I decided to move my build logic into a gradle plugin for deduplication, but when calling apply<KotlinMultiplatformPluginWrapper>() I get the error

Caused by: org.gradle.api.internal.AbstractMutationGuard$IllegalMutationException: Project#afterEvaluate(Action) on project '...' cannot be executed in the current context.
	at org.jetbrains.kotlin.gradle.plugin.KotlinMultiplatformPluginKt.whenEvaluated(KotlinMultiplatformPlugin.kt:236)

What should I do to fix this?

[tapchicoma]

I think it depends on your plugin code. Generally such message indicates your plugin tries to apply MPP plugin in some configuration action. For example such approach may cause it:

tasks.named("some-task") {
    project.plugins.apply<KotlinMultiplatformPluginWrapper>()
}

[martmists]

It's in my own plugin's apply function:

open class MyPlugin : Plugin<Project> {
    override fun apply(target: Project) = with(target) {
        apply<KotlinMultiplatformPluginWrapper>()
    }
}

[tapchicoma]

that is strange. Could it be your plugin is applied in such configuration block?

[martmists]

It looks like calling val jvmMain by sourceSets.registering in the kotlin{} block caused it, strange

[tapchicoma]

yes, as it is lazy configuration block. I think you could change it to by sourceSets.creating to eager create source set

[tapchicoma]

in this particular case eager creation should be ok