CompilationErrorException: "cannot convert from" native type when passing a value in a method in CSharpScript

Question

I'm currently trying to use scripts in C # and I have an error as shown below when calling the Test.DoThat method. If I change the DoThat method without a parameter, then it is ok. Please help.

Microsoft.CodeAnalysis.Scripting.CompilationErrorException: '(1,8): error CS1503: argument 1: cannot be converted from' Scripting.Device [Scripting, Version = 1.0.0.0, Culture = neutral, PublicKeyToken = null] 'to' Scripting. Device [C: \ Users \ sheehou \ Documents \ Code \ Scripting \ Scripting \ bin \ Debug \ Scripting.exe] ''

Here is my program:

using System;
using Microsoft.CodeAnalysis.Scripting;
using Microsoft.CodeAnalysis.CSharp.Scripting;

namespace Scripting
{
    public class Device
    {
        public string GetMessage()
        {
            return "Device";
        }
    }

    public class Test
    {
        public void DoThat(Device dev)
        {
            Console.WriteLine(dev.GetMessage());
        }
    }

    class Program6
    {
        static void Main(string[] args)
        {
            var test = new Test();

            var options = ScriptOptions.Default.AddReferences(typeof(Test).Assembly);
            var state = CSharpScript.RunAsync("", options, test, typeof(Test)).Result;
            state = state.ContinueWithAsync("using Scripting;").Result;
            state = state.ContinueWithAsync("Device dev = new Device();").Result;
            state = state.ContinueWithAsync("DoThat(dev);").Result;
            Console.Read();
        }
    }
}