Weird problem when creating a drawable with kotlin

[wspl]

When I was trying to create a drawable icon in a kotlin project:

val test1 = MaterialDrawableBuilder.with(applicationContext)
        .setIcon(MaterialDrawableBuilder.IconValue.WEATHER_RAINY)
        .setColor(Color.WHITE)

val test2 = test1.build()

Then Android Studio show a error:
Type net.steamcrafted.materialiconlib.MaterialDrawableBuilder.MaterialDrawable! is inaccessible in this context due to: net.steamcrafted.materialiconlib.MaterialDrawableBuilder.MaterialDrawable!

I was only import net.steamcrafted.materialiconlib.MaterialDrawableBuilder

Is this a bug or my mistake?
Hope someone can solve this problem, very thanks!

[wspl]

I has found out a temporary solution to solve this problem.

Firstly, create a util class with Java:

package moe.impl.v2exnext.utils;

import android.graphics.drawable.Drawable;
import net.steamcrafted.materialiconlib.MaterialDrawableBuilder;

public class MaterialDrawableBuilderFix {
    public static Drawable build(MaterialDrawableBuilder materialDrawableBuilder){
        return materialDrawableBuilder.build();
    }
}

Then create a drawable with kotlin:

val icon = MaterialDrawableBuilderFix.build(MaterialDrawableBuilder
                .with(applicationContext)
                .setIcon(MaterialDrawableBuilder.IconValue.WEATHER_RAINY)
                .setColor(Color.WHITE))

This seems like a bug of kotlin.

[code-mc]

You also need to chain the build method, you can't save the intermediate builder, the intermediate representation class was made private to prevent anyone from doing that.