Telerik.Sitefinity.SitefinityExceptions.ItemNotFoundException: You are trying to access Presentation item with id 7d44e1d3-7378-61ad-9066-ff000004e9e6 that no longer exists. The most probable reason is that it has been deleted by another user. at DynamicModule.ns.Wrapped_OpenAccessDynamicModuleProvider_97700bd57f5144c2b1c01adb39e2d7c1.GetDataItem(Type itemType, Guid id) at Telerik.Sitefinity.DynamicModules.DynamicModuleManager.GetDataItem(Type itemType, Guid id) at SitefinityWebApp.PDAC.Add_Presentation_To_Calender.ProcessRequest(HttpContext context) in f:\Inetpub\wwwroot\pdac\PDAC\Add_Presentation_To_Calender.ashx.cs:line 38