ASP。NET MVC 3 EntityType没有定义键

I want to display customer information. Then I created some classes; Customer, Delivery, Order, OrderLine, Product, and rentalDB. rentalDB class sets 5 DbSet of Product, Customer, Order, OrderLine, and Delivery. When I make UserController with list view, I cannot display the customer information, and it takes errors:I want to display customer information. Then I