System.Exception: ContentTypeService failed to find a content type with alias "".
   at Umbraco.Core.Models.PublishedContent.PublishedContentType.CreatePublishedContentType(PublishedItemType itemType, String alias)
   at Umbraco.Core.Cache.CacheProviderExtensions.<>c__DisplayClass9`1.<GetCacheItem>b__8()
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at Umbraco.Core.Cache.CacheProviderExtensions.GetCacheItem[T](ICacheProvider provider, String cacheKey, Func`1 getCacheItem)
   at Umbraco.Core.Models.PublishedContent.PublishedContentType.Get(PublishedItemType itemType, String alias)
   at Our.Umbraco.DocTypeGridEditor.Helpers.DocTypeGridEditorHelper.<>c__DisplayClass2.<ConvertValueToContent>b__0()
   at Our.Umbraco.DocTypeGridEditor.Helpers.DocTypeGridEditorHelper.ConvertValueToContent(String id, String docTypeAlias, String dataJson)
   at ASP._Page_app_plugins_doctypegrideditor_render_doctypegrideditor_cshtml.Execute() in c:\www\hoch-tirol.info\htdocs\App_Plugins\DocTypeGridEditor\Render\DocTypeGridEditor.cshtml:line 12
   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 Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer)
   at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)
   at ASP._Page_Views_Partials_grid_editors_base_cshtml.Execute() in c:\www\hoch-tirol.info\htdocs\Views\Partials\Grid\Editors\Base.cshtml:line 20