i have an error in C#

class Person
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }
class Pet
    {
        public string Name { get; set; }
        public Person Owner { get; set; }
    }
class Cat:Pet
    {
    }
class Dog:Pet
    {
    }
 class Program
    {
        static void Main(string[] args)
        {
            List<person> persons = new List<person>
            {
                new Person {FirstName="ganesh",LastName="swami"},
                new Person {FirstName="ranjit",LastName="swami"},
                new Person {FirstName="mahesh",LastName="biradar"},
                new Person {FirstName="vijay",LastName="shahane"},
                new Person{FirstName="pramod",LastName="pande"},


            };
            List<cat> cats = new List<cat>{
                new Cat {Name="mao",Owner="mahesh"},
                new Cat {Name="mao",Owner="ranjit"},
                new Cat {Name="mao",Owner="vijay"},
                new Cat {Name="mao",Owner="ganesh"},
            };

            List<dog> dogs = new List<dog>{
                new Dog{Name="mao",Owner="mahesh"},
                new Dog{Name="mao",Owner="vijay"},
                new Dog{Name="mao",Owner="pramod"},
                new Dog{Name="mao",Owner="ranjit"},
        };
        }