Не получается set в классе

[Stalkert]

class Cat(val name: String, weight_param: Int, breed_param: String) {

    var activities = arrayOf("Play"
    val breed = breed_param.toUpperCase()
    
    var weight = weight_param
        set(value) {
            Log.d("TAG", "in set()"
            if (value > 0) {
                Log.d("TAG", "yes"
                field = value
            }
            else {
                Log.d("TAG", "no"
                field = 0
            }
        }
    
    val weightInGramms: Int
        get() = weight * 1000

    fun sleep() {
        println(if (weight < 3) "сопит!" else "храпит!"
    }
}

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        Log.d("TAG", "----------------------------"

        val cat = Cat("Васька", -3, "Дворовая"
        Log.d("TAG", cat.weightInGramms.toString()) // возвращает 3000
        
        super.onCreate(savedInstanceState)
        setContentView(R.layout.content_main)
        text_id.setText("zzz2"
        // text_id.setText(getWarmth(c).toString())
    }

}

 android, kotlin