Kotlin Libraries Mod 1.17.1/1.16.2 is such a necessary mod that supports mods that use the Kotlin language. You must install this library mod first.
For your information, the Kottle mod has not received any updates so far. Besides, Kotlin for Forge needs to have the code changed. Therefore, the author decided to make a new project called Kotlin Libraries – a simple yet functional API and Library mod for Minecraft. This small project adds nothing but some Kotlin libraries that are necessary for some mods. If the mod you are using just needs Kotlin only, then you have to install this library mod.
Before you install it, make sure you meet its requirement first, which is Minecraft Forge being installed previously.
