MVC5:对象引用没有设置为对象的实例?

I'm not quite following why I am getting this error in my MVC5/EF6/Code First Migrations app. I am attempting to (in my list of Users) display the [Name] of the Organization or [Name] of the Sponsor the User is currently associated with. I have the following properties defined in my I'm not quite following why I am getting this e