Помогите с кодом не могу найти ошибку

package com.javarush.task.task02.task0213;

/*
Питомцам нужны люди
*/
public class Solution {
    public static void main(String[] args) {
       Cat cat = new Cat();
       Dog dog = new Dog();
       Fish fish = new Fish();
       Woman woman = new Woman();
       cat.owner = women;
       dog.owner = women;
       fish.owner = women;
        //напишите тут ваш код
    }

    public static class Cat {

        public Woman owner;
    }

    public static class Dog {

        public Woman owner;
    }

    public static class Fish {


        public Woman owner;
    }

    public static class Woman {

    }
}