System.NullReferenceException: Object reference not set to an instance of an object.
   at ASP._Page_Views_Partials_Documents_IFrame_cshtml.Execute() in d:\Apps\beQuotedNewsWebUmbraco7\Views\Partials\Documents\IFrame.cshtml:line 81
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
   at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
   at System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance)
   at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer)
   at Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer)
   at System.Web.Mvc.HtmlHelper.RenderPartialInternal(String partialViewName, ViewDataDictionary viewData, Object model, TextWriter writer, ViewEngineCollection viewEngineCollection)
   at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)
   at ASP._Page_Views_MacroPartials_DocumentsIframe_cshtml.Execute() in d:\Apps\beQuotedNewsWebUmbraco7\Views\MacroPartials\DocumentsIframe.cshtml:line 347