C#Unity错误:无法加载文件或程序集

我找到了这篇关于Unity的演示文章。看起来很简单,但我得到以下错误:

'System.Runtime.CompilerServices.Unsafe,版本=4.0.4.1, 区域性=中性,PublicKeyToken=b03f5f7f11d50a3a'或其 匹配程序集引用。(来自HRESULT的异常:0x8013100)

https://www.tutorialsteacher.com/ioc/register-and-resolve-in-unity-container

using System;
using Unity;

namespace UnityContainerDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            var container = new UnityContainer();
            container.RegisterType<ICar, BMW>();// Map ICar with BMW 

            //Resolves dependencies and returns Driver object 
            Driver drv = container.Resolve<Driver>();
            drv.RunCar();
        }
    }

    public interface ICar
    {
        int Run();
    }

    public class BMW : ICar
    {
        private int _miles = 0;

        public int Run()
        {
            return ++_miles;
        }
    }

    public class Ford : ICar
    {
        private int _miles = 0;

        public int Run()
        {
            return ++_miles;
        }
    }

    public class Audi : ICar
    {
        private int _miles = 0;

        public int Run()
        {
            return ++_miles;
        }

    }
    public class Driver
    {
        private ICar _car = null;

        public Driver(ICar car)
        {
            _car = car;
        }

        public void RunCar()
        {
            Console.WriteLine("Running {0} - {1} mile ", _car.GetType().Name, _car.Run());
        }
    }
}