Where are you getting cloth from? Join the discord for support: https://discord.gg/rbxu4Fk GitHub is only for bugs.

https://minecraft.curseforge.com/projects/cloth-config

Would you join the discord? Or I mean where did you get cloth from. (The maven)

I don't know how to use maven,so I download it from curseforge.
After I clone jroject and build it,I got a "ClothConfig-0.2.4.17-dev.jar"
Import this library,it work now

Please don't, just add these mavens:

repositories {
    maven { url "https://minecraft.curseforge.com/api/maven" }
}

dependencies {
    modCompile "cloth-config:ClothConfig:0.2.4.17"
    
    // The following line is optional but recommended.
    include "cloth-config:ClothConfig:0.2.4.17"
}