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Could Not Determine The Dependencies Of Task ':app:dokka'

I'm trying to use dokka on my android project to generate kdoc. But I have this error when I'm running the script 'modules:app [dokka]' : Could not determine the dependencies of task ':app:dokka'. kotlin.KotlinNullPointerException (no error message)

I added the following lines on my gradle files :

Project build.gradle

buildscript {
    ext {
        dokka_version = '0.9.18'
    }
    dependencies {
        classpath "org.jetbrains.dokka:dokka-android-gradle-plugin:$dokka_version"
    }
}

app build.gradle

plugins {
    id 'org.jetbrains.dokka-android'
}
dokka {
    outputFormat = 'html'
    sourceDirs = files('src/main')
    outputDirectory = "$buildDir/javadoc"
}

Could not determine the dependencies of task ':app:dokka'. kotlin.KotlinNullPointerException (no error message)

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Answer

The issue is that it's a multiplatform project. In the app level gradle file, I'm also applying the org.jetbrains.kotlin.multiplatform plugin. As described in the dokka github release page:

Experimental Kotlin Multiplatform support is scheduled for 0.9.19

Looks like there's no other solution than wait for the next release of dokka.

Edit: There's a workaround described on the kolinlang forum

dokka {
    impliedPlatforms = ["common"] // This will force platform tags for all non-common sources e.g. "JVM"
    kotlinTasks {
        // dokka fails to retrieve sources from MPP-tasks so they must be set empty to avoid exception
        // use sourceRoot instead (see below)
        []
    }
    sourceRoot {
        // assuming there is only a single source dir...
        path = kotlin.sourceSets.commonMain.kotlin.srcDirs[0]
        platforms = ["common"]
    }
}
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source: stackoverflow.com
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