Failure while uploading file Using MVC 4

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ASP.NET

.NET

MVC4

FileIO

I am trying to upload an image using MVC 4. But it throws an exception of type 'System.NullReferenceException' occurred in GMS1.dll but was not handled in user code.

My code is as follows

<form action="" method="post" enctype="multipart/form-data">

  <label for="file">Filename:</label>
  <input type="file" name="file" id="file" />

  <input type="submit" />
</form>

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace GMS1.Controllers
{
    public class FileUploadController : Controller
    {
        //
        // GET: /FileUpload/

        public ActionResult Index()
        {
            return View();
        }

        [HttpPost]
        public ActionResult Index(HttpPostedFileBase file)
        {

            if (file.ContentLength > 0)
            {
                var fileName = Path.GetFileName(file.FileName);
                var path = Path.Combine(Server.MapPath("~/UserImages/"), fileName);
                file.SaveAs(path);
            }

            return RedirectToAction("Index");
        }

    }
}

can anyone would like to solve this issue ? Any help would be grateful .. Thanks in advance