An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter - dictionary

Question

I am struck at this code, i get this error when whenever i tried to see a list of articles.
the error is The parameters dictionary contains a null entry for parameter articleId of non-nullable type System.Int32 for method System.Web.Mvc.ActionResult Detail(Int32) in Crossroads.Controllers.ArticleController. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.
Parameter name: parameters.
Here is the controller:
using System;
using System.Collections.Generic;
using System.Web.Mvc;
using System.Web.Security;
using Crossroads.Models;
using System.Linq;
using System.Web;
using Crossroads.Models.Repositories;
namespace Crossroads.Controllers
{
[HandleError]
public class ArticleController : BaseController
{
private IArticleRepository _ArticleRepository;
public ArticleController()
: this(new ArticleRepository())
{ }
public ArticleController(IArticleRepository articleRepo)
{
_ArticleRepository = articleRepo;
}
public ActionResult Index(bool? archived)
{
if (archived != null && archived.Value.Equals(true))
{
return View("IndexArchived", _ArticleRepository.ListArchivedArticles());
}
else
{
return View(_ArticleRepository.ListArticles());
}
}
public ActionResult Detail(int Id)
{
var article = _ArticleRepository.GetArticle(Id);
if (article.Published)
{
return View("Details", article);
}
else
{
postStatus = new PostStatusViewModel()
{
Status = Status.Warning,
Message = "I'm sorry, article " + article.Title + " has been deleted. <br />Please update your bookmark."
};
return RedirectToAction("PostStatus", postStatus);
}
}
public ActionResult Details(int id, string articleTitle)
{
return RedirectToAction("Detail", id);
}
[Authorize(Roles = "Manager")]
public ActionResult New()
{
return View("New", new Articles());
}
[Authorize(Roles = "Manager")]
[ValidateInput(false)]
public ActionResult Edit(int id)
{
var viewModel = _ArticleRepository.GetArticle(id);
return View(_ArticleRepository.GetArticle(id));
}
[AcceptVerbs(HttpVerbs.Post)]
[ValidateAntiForgeryToken]
[ValidateInput(false)]
[Authorize(Roles = "Manager")]
public ActionResult Create(Articles model)
{
try
{
model.CreatedBy = Membership.GetUser().UserName;
model.CreatedDate = DateTime.Now;
model.ModifiedBy = Membership.GetUser().UserName;
model.ModifiedDate = DateTime.Now;
_ArticleRepository.CreateArticle(model);
return RedirectToAction("Index");
}
catch
{
return View("Edit", model.Id);
}
}
[AcceptVerbs(HttpVerbs.Post)]
[ValidateAntiForgeryToken]
[ValidateInput(false)]
[Authorize(Roles = "Manager")]
public ActionResult Update(Articles model)
{
try
{
model.ModifiedBy = Membership.GetUser().UserName;
model.ModifiedDate = DateTime.Now;
_ArticleRepository.EditArticle(model);
return RedirectToAction("Details", new { id = model.Id });
}
catch (Exception ex)
{
_DBLogging.LoggError(ex);
postStatus = new PostStatusViewModel()
{
Status = Status.Error,
Message = ""
};
return View("Edit");
}
}
public JsonResult ManageArchiveArticle(int articleId, bool isArchived)
{
var result = new Dictionary<string, string>();
try
{
var article = _ArticleRepository.GetArticle(articleId);
article.IsArchived = isArchived ? false : true;
article.ModifiedBy = Membership.GetUser().UserName;
article.ModifiedDate = DateTime.Now;
if (article.IsArchived) article.ArchiveDate = DateTime.Now;
article = _ArticleRepository.EditArticle(article);
result.Add("isArchived", article.IsArchived.ToString().ToLower());
}
catch (Exception ex)
{
_DBLogging.LoggError(ex);
}
return Json(result);
}
public JsonResult ManagePublishArticle(int articleId, bool isPublished)
{
var result = new Dictionary<string, string>();
try
{
var article = _ArticleRepository.GetArticle(articleId);
article.Published = isPublished ? false : true;
article.ModifiedBy = Membership.GetUser().UserName;
article.ModifiedDate = DateTime.Now;
article = _ArticleRepository.EditArticle(article);
result.Add("isPublished", article.Published.ToString().ToLower());
}
catch (Exception ex)
{
_DBLogging.LoggError(ex);
}
return Json(result);
}
}
}
here is my index
<ul class="menu">
<li><%= Html.ActionLink("Article List", "Index", "Article")%></li>
<li><%= Html.ActionLink("New Article", "New", "Article")%></li>
</ul>