Ошибка C#, что делать?

using System;
using System.Collections.Generic;
using System.Text;
using Sys = Cosmos.System;

namespace CosmosKernel2
{
public class Kernel : Sys.Kernel
{

protected override void BeforeRun()
{
Console.WriteLine("Cosmos booted successfully. Type a line of text to get it echoed back.");
}

protected override void Run()
{
Console.Write("Input: ");
var input = Console.ReadLine();
Console.Write("Text typed: ");
Console.WriteLine(input);
}
}
}