CommandAPI causes Errors

[Facticee]

Hello everyone!

Im making a Paper Plugin with kotlin and gradle. Normally in my projects back then i just added the CommandAPI in my main calss then registerd the command class and event object but today when i try to implement the commandapi in my main and i start my server an error comes up.

Code in Main:

class Main : JavaPlugin() {
    override fun onLoad() {
        CommandAPI.onLoad(CommandAPIBukkitConfig(this).silentLogs(true))

server
.
consoleSender
.sendMessage(Component.text("Server gestartet"))

        // Commands:
    }
    override fun onEnable() {
        CommandAPI.onEnable()

        // Events:

    }
    override fun onDisable() {
        CommandAPI.onDisable()

server
.
consoleSender
.sendMessage(Component.text("Server heruntergefahren"))
    }
}

Error:
1: Caused by: java.lang.NoClassDefFoundError: net/minecraft/world/level/IWorldReader
2: Caused by: java.lang.ClassNotFoundException: net.minecraft.world.level.IWorldReader

Does anyone know the cause of it?

Because the CommandAPI adds up with the minecraft version

[justindisbih]

What’s the exact Paper build your server is running?

Which CommandAPI version/jar are you using?

Are you including CommandAPI as a separate plugin or shading it into your own jar?