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 148:            var item = ((Kooboo.CMS.Content.Models.TextContent)conferenceFolder).Children("Viasm~ConferenceDetail").WhereEquals("Url", itemuserkey).FirstOrDefault();
Line 149:            <div class="box-about">
Line 150:                <h3 class="title">@item["Title"]</h3>
Line 151:                @{
Line 152:                    int result = DateTime.Compare(DateTime.Now, starDateTime);

Source File: d:\IIS\viasm.edu.vn\Cms_Data\Sites\viasm\Templates\Views\Conference.DetailsConference\template.cshtml    Line: 150

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   ASP._Page_Cms_Data_Sites_viasm_Templates_Views_Conference_DetailsConference_template_cshtml.Execute() in d:\IIS\viasm.edu.vn\Cms_Data\Sites\viasm\Templates\Views\Conference.DetailsConference\template.cshtml:150
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +251
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +146
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +121
   Kooboo.CMS.Sites.View.PositionRender.ViewRender.RenderViewInternal(HtmlHelper htmlHelper, String viewPath, ViewDataDictionary viewData, Object model) +333
   Kooboo.CMS.Sites.View.PositionRender.ViewRender.RenderView(HtmlHelper htmlHelper, Page_Context pageContext, String viewName, ViewDataDictionary viewData, Object parameters, Boolean executeDataRule) +723
   Kooboo.CMS.Sites.View.FrontHtmlHelper.RenderView(String viewName, ViewDataDictionary viewData, Object parameters, Boolean executeDataRule) +60
   Kooboo.CMS.Sites.View.<>c__DisplayClass13.<RenderView>b__11() +88
   Kooboo.CMS.Sites.View.FrontHtmlHelper.RenderView(ViewPosition viewPosition) +579
   Kooboo.CMS.Sites.View.<RenderPositionContents>d__b.MoveNext() +429
   System.Linq.Buffer`1..ctor(IEnumerable`1 source) +261
   System.Linq.Enumerable.ToArray(IEnumerable`1 source) +91
   Kooboo.CMS.Sites.View.FrontHtmlHelper.Position(String positionID, Func`1 defaultContentFunc) +291
   ASP._Page_Cms_Data_Sites_viasm_Templates_Layouts_SlideBarLeft_template_cshtml.Execute() in d:\IIS\viasm.edu.vn\Cms_Data\Sites\viasm\Templates\Layouts\SlideBarLeft\template.cshtml:27
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +252
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +147
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +122
   System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +375
   Kooboo.CMS.Sites.Controllers.PageControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +85
   System.Web.Mvc.<>c__DisplayClass1a.<InvokeActionResultWithFilters>b__17() +31
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +436
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +436
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +436
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +436
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +436
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +436
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +436
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +436
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +436
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +436
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +436
   System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +658
   System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__19() +39
   System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +25
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +73
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +25
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +59
   System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +41
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +25
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +59
   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:4.7.3062.0