[MESSAGE] : Object reference not set to an instance of an object.
[STACK] :
at Ifx.Engine.Site.Views.Entities.References.Handlers.ReferenceDocumentHandler.GetContentType(ReferenceDocument document)
at Ifx.Engine.Site.Views.Entities.References.Handlers.ReferenceDocumentHandler.LoadDocument(EngineContext context, ReferenceDocument document)
at Ifx.Engine.Site.Views.Entities.References.Handlers.ReferenceDocumentHandler.ProcessRequest(HttpContext httpContext)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)