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System.Exception: Invalid Type: A Mapper could not be resolved based on the passed in Type
   at Umbraco.Core.Persistence.Mappers.MappingResolver.<>c__DisplayClass2_0.<ResolveMapperByType>b__0(Type type1)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at Umbraco.Core.Persistence.Mappers.MappingResolver.ResolveMapperByType(Type type)
   at Umbraco.Core.Persistence.Querying.ModelToSqlExpressionHelper`1..ctor()
   at Umbraco.Core.Persistence.Querying.Query`1.Where(Expression`1 predicate)
   at Umbraco.Core.Services.ContentTypeService.GetMediaType(String alias)
   at Umbraco.Core.Models.PublishedContent.PublishedContentType.CreatePublishedContentType(PublishedItemType itemType, String alias)
   at Umbraco.Core.Models.PublishedContent.PublishedContentType.<>c__DisplayClass22_0.<Get>b__0()
   at Umbraco.Core.Cache.CacheProviderExtensions.<>c__DisplayClass5_0`1.<GetCacheItem>b__0()
   at Umbraco.Core.Cache.StaticCacheProvider.<>c__DisplayClass11_0.<GetCacheItem>b__0(String key)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at Umbraco.Core.Cache.StaticCacheProvider.GetCacheItem(String cacheKey, Func`1 getCacheItem)
   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 Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedMediaCache.DictionaryPublishedContent..ctor(IDictionary`2 valueDictionary, Func`2 getParent, Func`2 getChildren, Func`3 getProperty, Boolean fromExamine)
   at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedMediaCache.ConvertFromSearchResult(SearchResult searchResult)
   at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedMediaCache.GetUmbracoMedia(Int32 id)
   at Umbraco.Web.PublishedCache.ContextualPublishedCache`1.GetById(Boolean preview, Int32 contentId)
   at Umbraco.Web.PublishedContentQuery.DocumentById(Int32 id, ContextualPublishedCache cache, Object ifNotFound)
   at ASP._Page_app_plugins_homepagefeaturedlist_homepagefeaturedlist_cshtml.Execute() in c:\Projects\origin-www.monotype.com\build\App_Plugins\HomePageFeaturedList\HomePageFeaturedList.cshtml:line 22
   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:\Projects\origin-www.monotype.com\build\Views\Partials\Grid\Editors\Base.cshtml:line 20