How to reslove this problem?

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C#

Hi everyone! My question how to reslove this problem : System.ArgumentException: 'A null StrongName was found in the full trust assembly list.'. Here is my code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Security;
using System.Security.Policy;
using System.Security.Permissions;
using System.Reflection;
using System.Runtime.Remoting;
using System.Threading.Tasks;

class Sandboxer : MarshalByRefObject
{

    const string pathToUntrusted = @"C:\\Users\\Ugljesa\\source\\repos\\UkiSandbox.UKI.COMPUTERS\\UkiSandbox\\bin\\Debug";
    const string untrustedAssembly = @"C:\\Users\\Ugljesa\\Desktop\\mynew.snk";
    const string untrustedClass = "UntrustedCode.UntrustedClass";
    const string entryPoint = "IsFibonacci";

    private static Object[] parameters = { 45 };
    static void Main()
    {



        Console.BackgroundColor = ConsoleColor.DarkGreen;
        Console.ForegroundColor = ConsoleColor.Black;
        Console.Title = "UkiSandbox - Running app on :   " + pathToUntrusted;
        Console.WriteLine("UkiSandbox is running. Specified location is:          " + pathToUntrusted);



        AppDomainSetup adSetup = new AppDomainSetup();
        adSetup.ApplicationBase = Path.GetFullPath(pathToUntrusted);


        PermissionSet permSet = new PermissionSet(PermissionState.None);
        permSet.AddPermission(new SecurityPermission(SecurityPermissionFlag.Execution));


        Evidence evidence = AppDomain.CurrentDomain.Evidence;
        StrongName fullTrustAssembly = typeof(Sandboxer).Assembly.Evidence.GetHostEvidence<StrongName>();


        AppDomain newDomain = AppDomain.CreateDomain("Sandbox", evidence, adSetup, permSet, fullTrustAssembly);



        ObjectHandle handle = Activator.CreateInstanceFrom(
            newDomain, typeof(Sandboxer).Assembly.ManifestModule.FullyQualifiedName,
            typeof(Sandboxer).FullName
            );


        Sandboxer newDomainInstance = (Sandboxer)handle.Unwrap();
        newDomainInstance.ExecuteUntrustedCode(untrustedAssembly, untrustedClass, entryPoint, parameters);

    }
    public void ExecuteUntrustedCode(string assemblyName, string typeName, string entryPoint, Object[] parameters)
    {

        MethodInfo target = Assembly.Load(assemblyName).GetType(typeName).GetMethod(entryPoint);
        try
        {

            bool retVal = (bool)target.Invoke(null, parameters);
        }
        catch (Exception ex)
        {

            new PermissionSet(PermissionState.Unrestricted).Assert();
            Console.WriteLine("SecurityException caught:\n{0}", ex.ToString());
            CodeAccessPermission.RevertAssert();
            Console.ReadLine();
        }
    }
}

And problem in this line code (two):

StrongName fullTrustAssembly = typeof(Sandboxer).Assembly.Evidence.GetHostEvidence<StrongName>();


        AppDomain newDomain = AppDomain.CreateDomain("Sandbox", evidence, adSetup, permSet, fullTrustAssembly);

.
And problem is this: System.ArgumentException: 'A null StrongName was found in the full trust assembly list.'. How to reslove this? Thanks advance.

What I have tried:

I'am don't know what to do. I'am tryed something steps: RESULT: FAILED.