Why doesn't an object reference point to an object instance?

Question

C++ / C#

This exception is thrown when trying to create an object of the Equipment class and add it to the List

. What is the problem?
Equipment class:

public class Equipment
    {
        public int countRun { get; set; }
        public List<string> Boots { get; set; }
        public List<string> Armors { get; set; }
        public List<string> Gloves { get; set; }
        public List<string> Helms { get; set; }
        public List<string> Rings { get; set; }
        public List<string> Amuls { get; set; }
        public List<string> Formuls { get; set; }

        public Equipment()
        {
            this.countRun = 0;
            this.Boots = null;
            this.Armors = null;
            this.Gloves = null;
            this.Helms = null;
            this.Rings = null;
            this.Amuls = null;
            this.Formuls = null;
        }
    }

The Equips class (serves only for storing a few objects of type Equipment):

static class Equips
    {
        public static List<Equipment> Equip { get; set; }
    }

Answer 1

You declared a variable Equipas a list, but you didn't create the list itself, where is it new?