Error handling 当我从控制器操作引发异常时，自定义错误处理结果为InvalidOperationException

Web.config:

<customErrors mode="On" defaultRedirect="~/Error/">
    <error statusCode="404" redirect="~/Error/NotFound/"/>
    <error statusCode="403" redirect="~/Error/AccessDenied/"/>
<\customErrors>

public static void RegisterGlobalFilters(GlobalFilterCollection filters) 
{
    filters.Add(new HandleErrorAttribute());
    filters.Add(new LtcAuthorizeAttribute());
}

我正在从控制器操作引发异常，以便在自定义错误视图上查看异常：

public ActionResult Index(int id) 
{
    if (id == 69732645)
    {
        throw new Exception("This is just to test an Error.");
    }
    var repository = ClaimsHelper.GetRepository();
    var rfbEntity = repository.Single<RequestForBenefit>(x => x.RfbId == id);
    var rfbModel = Mapper.Map<RequestForBenefit, RequestForBenefitModel>(rfbEntity);
    ViewBag.EobList = Mapper.Map<ICollection<EpisodeOfBenefit>, ICollection<EpisodeOfBenefitModel>>(rfbModel.EpisodeOfBenefit);
    repository.Dispose();
    return View(rfbModel);
}

抛出异常时，会发生另一个异常，该异常显示在视图上，而不是我从索引操作中故意抛出的异常

以下是错误视图中显示的内容：

Controller: Error 
Action: Index 
Message: Object reference not set to an instance of an object. 

Controller: 
at ASP._Page_Views_Error_Error_cshtml.Execute() in c:\Workspace\LTCClaims\Branches\Active\LtcClaims-2013Q1\Univita.LtcClaims\Univita.LtcClaims\Views\Error\Error.cshtml:line 12 
at System.Web.WebPages.WebPageBase.ExecutePageHierarchy() 
at System.Web.Mvc.WebViewPage.ExecutePageHierarchy() 
at System.Web.WebPages.StartPage.RunPage() 
at System.Web.WebPages.StartPage.ExecutePageHierarchy() 
at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) 
at System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) 
at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) 
at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) 
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) 
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1a.<InvokeActionResultWithFilters>b__17() 
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) 
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1a.<>c__DisplayClass1c.<InvokeActionResultWithFilters>b__19() 
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) 
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.<>c__DisplayClass2a.<BeginInvokeAction>b__20() 
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) 

控制器：错误
行动：索引
消息：对象引用未设置为对象的实例。
控制器：
在c:\Workspace\ltclaims\branchs\Active\ltclaims-2013Q1\Univita.ltclaims\Univita.ltclaims\Univita.ltclaims\Views\Error\Error.cshtml第12行中的ASP.\u Page\u Views\Error\cshtml.Execute（）
在System.Web.WebPages.WebPageBase.ExecutePageHierarchy（）中
在System.Web.Mvc.WebViewPage.ExecutePageHierarchy（）中
在System.Web.WebPages.StartPage.RunPage（）中
在System.Web.WebPages.StartPage.ExecutePageHierarchy（）中
位于System.Web.WebPages.WebPageBase.ExecutePageHierarchy（WebPageContext pageContext、TextWriter writer、WebPageRenderingBase起始页）
位于System.Web.Mvc.RazorView.RenderView（ViewContext-ViewContext、TextWriter-writer、对象实例）
位于System.Web.Mvc.BuildManagerCompiledView.Render（ViewContext、ViewContext、TextWriter）
在System.Web.Mvc.ViewResultBase.ExecuteSult（ControllerContext上下文）中
位于System.Web.Mvc.ControllerActionInvoker.InvokeActionResult（ControllerContext ControllerContext，ActionResult ActionResult）
在System.Web.Mvc.ControllerActionInvoker.c_uuDisplayClass1A.b_uuu17（）中
位于System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter（IResultFilter筛选器、ResultExecutingContext预文本、Func`1 continuation）
在System.Web.Mvc.ControllerActionInvoker.c_uuDisplayClass1A.c_uuDisplayClass1C.b_uu19（）中
位于System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters（ControllerContext ControllerContext，IList`1 filters，ActionResult ActionResult）
在System.Web.Mvc.Async.AsyncControllerActionInvoker.c_uuDisplayClass25.c_uuDisplayClass2A.b_u20（）中
在System.Web.Mvc.Async.AsyncControllerActionInvoker.c__DisplayClass25.b__22（IAsyncResult asyncResult）

有人能告诉我为什么在我抛出

异常

后会出现

操作有效性异常

？我错过什么了吗

Controller: Error 
Action: Index 
Message: Object reference not set to an instance of an object. 

Controller: 
at ASP._Page_Views_Error_Error_cshtml.Execute() in c:\Workspace\LTCClaims\Branches\Active\LtcClaims-2013Q1\Univita.LtcClaims\Univita.LtcClaims\Views\Error\Error.cshtml:line 12 
at System.Web.WebPages.WebPageBase.ExecutePageHierarchy() 
at System.Web.Mvc.WebViewPage.ExecutePageHierarchy() 
at System.Web.WebPages.StartPage.RunPage() 
at System.Web.WebPages.StartPage.ExecutePageHierarchy() 
at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) 
at System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) 
at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) 
at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) 
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) 
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1a.<InvokeActionResultWithFilters>b__17() 
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) 
at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1a.<>c__DisplayClass1c.<InvokeActionResultWithFilters>b__19() 
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) 
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.<>c__DisplayClass2a.<BeginInvokeAction>b__20() 
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult)