Server Error in '/' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 507:                                @{
Line 508:
Line 509:                                    List<Listing> listingsOfVenue = CacheManager.ListWhatsOn.Where(x => x.Venues != null).Where(x => x.Venues.IndexOf(venuename) > -1).Where(x => Common.isValidListing(x)).ToList();
Line 510:                                    listingsOfVenue = listingsOfVenue.Where(x => x.Categories != null).Where(x => x.Categories.IndexOf("Symposium Timetable") == -1 && x.Categories.IndexOf("Welcome Programme Timetable") == -1).ToList();
Line 511:                                    listingsOfVenue = listingsOfVenue.OrderBy(x => x.listing_title.Replace("The ", "").Replace("A ", "")).ToList();

Source File: d:\Websites\multisite3.21stcd.com\Views\TwentyFirstCD\Event-Layout2.cshtml    Line: 509

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   ASP._Page_Views_TwentyFirstCD_Event_Layout2_cshtml.<Execute>b__a(Listing x) in d:\Websites\multisite3.21stcd.com\Views\TwentyFirstCD\Event-Layout2.cshtml:509
   System.Linq.<>c__DisplayClass6_0`1.<CombinePredicates>b__0(TSource x) +28
   System.Linq.<>c__DisplayClass6_0`1.<CombinePredicates>b__0(TSource x) +28
   System.Linq.WhereEnumerableIterator`1.MoveNext() +125
   System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +503
   System.Linq.Enumerable.ToList(IEnumerable`1 source) +69
   ASP._Page_Views_TwentyFirstCD_Event_Layout2_cshtml.Execute() in d:\Websites\multisite3.21stcd.com\Views\TwentyFirstCD\Event-Layout2.cshtml:509
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +251
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +147
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +121
   Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer) +193
   System.Web.Mvc.Html.RenderPartialExtensions.RenderPartial(HtmlHelper htmlHelper, String partialViewName) +95
   ASP._Page_Views_TwentyFirstCD_Event_cshtml.Execute() in d:\Websites\multisite3.21stcd.com\Views\TwentyFirstCD\Event.cshtml:11
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +251
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +147
   System.Web.WebPages.StartPage.ExecutePageHierarchy() +85
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +106
   Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer) +193
   System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +374
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +87
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +775
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +775
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +775
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +81
   System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +188
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +38
   System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +29
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +73
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +52
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +39
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +38
   System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +43
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +73
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +38
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +602
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +195
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +128


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.4063.0