ASP.Net MVC Error: The parameters dictionary contains a null entry for parameter id of non-nullable type System.Int32

I am getting the following error:

The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult Details(Int32)' in 'MVCDemo1.Controllers.EmployeeController'. 

I have the following code:

 Employee.cs

using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Web;

namespace MVCDemo1.Models
{
    [Table("tblEmployee")]
    public class Employee
    {
        [Key]
        public int EmployeeId { get; set; }
        public string Name { get; set; }
        public string Gender { get; set; }
        public string City { get; set; }
    }
}

EmployeeController.cs

using MVCDemo1.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MVCDemo1.Controllers
{
    public class EmployeeController : Controller
    {
        // GET: Employee
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult Details(int id)
        {
            EmployeeContext employeeContext = new EmployeeContext();
            Employee employee = employeeContext.Employees.Single(x => x.EmployeeId == id);

            return View(employee);
        }
    }
}

 Details.chtml

@model MVCDemo1.Models.Employee

@{
    ViewBag.Title = "Employee Details";
}

<h2>Employee Details</h2>

<table style="font-family:Arial">
    <tr>
        <td>Employee ID:</td>
        <td>@Model.EmployeeId</td>
    </tr>
    <tr>
        <td>Name:</td>
        <td>@Model.Name</td>
    </tr>
    <tr>
        <td>Gender:</td>
        <td>@Model.Gender</td>
    </tr>
    <tr>
        <td>City:</td>
        <td>@Model.City</td>
    </tr>
</table>

 EmployeeContext.css

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;

namespace MVCDemo1.Models
{
    public class EmployeeContext
    {
        public DbSet<Employee> Employees { get; set; }
    }
}

 global.asax.cs

 protected void Application_Start()
 {         
    Database.SetInitializer<MVCDemo1.Models.EmployeeContext>(null);
    AreaRegistration.RegisterAllAreas();
    FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
    RouteConfig.RegisterRoutes(RouteTable.Routes);
    BundleConfig.RegisterBundles(BundleTable.Bundles);
}

I am getting the error in gobal.asax file.