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POASP MVC.NET3 Local IIS7 object reference error
 

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    <p>During development of an mvc web application, I'm encourtering issues running the local instance of the site. When I try to reload a page, after a successful first load, I'm seeing the below error. If I run the site through the VS virtual server, there are no issues. My app pool is running in integrated mode and it is running .net 4. Any idea why this is occurring? Is this enough information?</p> <blockquote> <p>[NullReferenceException: Object reference not set to an instance of an object.] System.Web.HttpServerVarsCollection.Get(String name) +109 System.Web.Mvc.UrlRewriterHelper.WasThisRequestRewritten(HttpContextBase httpContext) +59 System.Web.Mvc.PathHelpers.GenerateClientUrlInternal(HttpContextBase httpContext, String contentPath) +213 System.Web.Mvc.PathHelpers.GenerateClientUrlInternal(HttpContextBase httpContext, String contentPath) +168 System.Web.Mvc.PathHelpers.GenerateClientUrl(HttpContextBase httpContext, String contentPath) +148 LeadManager.Web.UI.Helpers.MenuHelper.GenerateUrl(String url) in C:\Development\Hg\LeadManager\Web.UI\Helpers\MenuHelper.cs:1132 LeadManager.Web.UI.Helpers.MenuHelper.BuildLeadManagementMenu(Menu navMenu, Agent agent) in C:\Development\Hg\LeadManager\Web.UI\Helpers\MenuHelper.cs:554 LeadManager.Web.UI.Helpers.MenuHelper.AddNavMenu(Agent agent) in C:\Development\Hg\LeadManager\Web.UI\Helpers\MenuHelper.cs:530 ASP._Page_Views_Shared__Layout_cshtml.Execute() in c:\Development\Hg\LeadManager\Web\Views\Shared_Layout.cshtml:115 System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +279 System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +103 System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +172 System.Web.WebPages.WebPageBase.Write(HelperResult result) +88 System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action<code>1 body) +233 System.Web.WebPages.WebPageBase.PopContext() +233 System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +377 System.Web.Mvc.&lt;&gt;c__DisplayClass1c.&lt;InvokeActionResultWithFilters&gt;b__19() +32 System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func</code>1 continuation) +748196 System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func<code>1 continuation) +748196 System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList</code>1 filters, ActionResult actionResult) +265 System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +748160 System.Web.Mvc.Controller.ExecuteCore() +159 System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +334 System.Web.Mvc.&lt;>c_<em>DisplayClassb.b</em>_5() +62 System.Web.Mvc.Async.&lt;>c_<em>DisplayClass1.b</em>_0() +15 System.Web.Mvc.&lt;>c_<em>DisplayClasse.b</em>_d() +52 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +437 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +354</p> </blockquote> <p>MenuHelper is used to build navigation menus. The code that fails is the return statement outside of the if:</p> <pre><code>private static string GenerateUrl(string url) { if (instance == null) { // hack to enable using this on old web forms pages return UrlHelper.GenerateContentUrl(url, new HttpContextWrapper(HttpContext.Current)); } return (new UrlHelper(instance.htmlHelper.ViewContext.RequestContext)).Content(url); } private static string GenerateUrl(string actionName, string controllerName) { if (instance == null) { // hack to enable using this on old web forms pages return GenerateUrl(String.Format("{0}/{1}", controllerName, actionName)); } if (instance.htmlHelper == null) throw new InvalidOperationException("htmlHelper has not been populated."); if (instance.htmlHelper.ViewContext == null) throw new InvalidOperationException("ViewContext has not been populated."); if (instance.htmlHelper.ViewContext.RequestContext == null) throw new InvalidOperationException("RequestContext has not been populated."); UrlHelper urlHelper = new UrlHelper(instance.htmlHelper.ViewContext.RequestContext); if (urlHelper == null) throw new InvalidOperationException("UrlHelper has not been populated."); if (String.IsNullOrEmpty(actionName)) throw new InvalidOperationException("actionName has not been populated."); if (String.IsNullOrEmpty(controllerName)) throw new InvalidOperationException("controllerName has not been populated."); return (urlHelper.Action(actionName, controllerName)); } </code></pre>
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    1. COWhat is your MenuHelper.GenerateUrl doing? Can you post your code?
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    2. COi updated the question with a code sample
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    3. CONobody can tell you why your object is null. I would suggest to run the app and then attach to the process to debug and see what's going on.
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