System.Exception: Exception while creating a value. ---> System.IO.IOException: An unexpected network error occurred.

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.ReadCore(Byte[] buffer, Int32 offset, Int32 count)
   at System.IO.FileStream.Read(Byte[] array, Int32 offset, Int32 count)
   at System.IO.BinaryReader.Read(Byte[] buffer, Int32 index, Int32 count)
   at Lucene.Net.Store.SimpleFSDirectory.SimpleFSIndexInput.ReadInternal(Byte[] b, Int32 offset, Int32 len)
   at Lucene.Net.Store.BufferedIndexInput.ReadBytes(Byte[] b, Int32 offset, Int32 len, Boolean useBuffer)
   at Lucene.Net.Index.CompoundFileReader.CSIndexInput.ReadInternal(Byte[] b, Int32 offset, Int32 len)
   at Lucene.Net.Store.BufferedIndexInput.Refill()
   at Lucene.Net.Store.BufferedIndexInput.ReadByte()
   at Lucene.Net.Store.IndexInput.ReadVInt()
   at Lucene.Net.Index.SegmentTermDocs.Read(Int32[] docs, Int32[] freqs)
   at Lucene.Net.Search.MultiTermQueryWrapperFilter.TermGenerator.Generate(MultiTermQuery query, IndexReader reader, TermEnum enumerator)
   at Lucene.Net.Search.MultiTermQueryWrapperFilter.GetDocIdSet(IndexReader reader)
   at Lucene.Net.Search.ConstantScoreQuery.ConstantScorer..ctor(ConstantScoreQuery enclosingInstance, Similarity similarity, IndexReader reader, Weight w)
   at Lucene.Net.Search.ConstantScoreQuery.ConstantWeight.Scorer(IndexReader reader, Boolean scoreDocsInOrder, Boolean topScorer)
   at Lucene.Net.Search.BooleanQuery.BooleanWeight.Scorer(IndexReader reader, Boolean scoreDocsInOrder, Boolean topScorer)
   at Lucene.Net.Search.BooleanQuery.BooleanWeight.Scorer(IndexReader reader, Boolean scoreDocsInOrder, Boolean topScorer)
   at Lucene.Net.Search.IndexSearcher.Search(Weight weight, Filter filter, Collector collector)
   at Lucene.Net.Search.Searcher.Search(Query query, Collector results)
   at Examine.LuceneEngine.SearchResults.DoSearch(Query query, IEnumerable`1 sortField, Int32 maxResults)
   at Examine.LuceneEngine.Providers.BaseLuceneSearcher.Search(ISearchCriteria searchParams, Int32 maxResults)
   at Examine.LuceneEngine.Providers.BaseLuceneSearcher.Search(ISearchCriteria searchParams)
   at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedMediaCache.GetUmbracoMediaCacheValues(Int32 id)
   at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedMediaCache.<>c__DisplayClass20.<GetCacheValues>b__1f()
   at Umbraco.Core.Cache.DictionaryCacheProviderBase.<>c__DisplayClass1.<GetSafeLazy>b__0()
   --- End of inner exception stack trace ---
   at Umbraco.Core.Cache.HttpRuntimeCacheProvider.GetCacheItem(String cacheKey, Func`1 getCacheItem, Nullable`1 timeout, Boolean isSliding, CacheItemPriority priority, CacheItemRemovedCallback removedCallback, CacheDependency dependency)
   at Umbraco.Core.Cache.HttpRuntimeCacheProvider.GetCacheItem(String cacheKey, Func`1 getCacheItem, Nullable`1 timeout, Boolean isSliding, CacheItemPriority priority, CacheItemRemovedCallback removedCallback, String[] dependentFiles)
   at Umbraco.Core.Cache.DeepCloneRuntimeCacheProvider.GetCacheItem(String cacheKey, Func`1 getCacheItem, Nullable`1 timeout, Boolean isSliding, CacheItemPriority priority, CacheItemRemovedCallback removedCallback, String[] dependentFiles)
   at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedMediaCache.GetCacheValues(Int32 id, Func`2 func)
   at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedMediaCache.GetUmbracoMedia(Int32 id)
   at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedMediaCache.GetById(UmbracoContext umbracoContext, Boolean preview, Int32 nodeId)
   at Umbraco.Web.PublishedCache.ContextualPublishedCache`1.GetById(Boolean preview, Int32 contentId)
   at Umbraco.Web.UmbracoHelper.TypedMedia(Guid id)
   at Umbraco.Web.PropertyEditors.ValueConverters.MediaPickerPropertyConverter.ConvertSourceToObject(PublishedPropertyType propertyType, Object source, Boolean preview)
   at Our.Umbraco.DocTypeGridEditor.Models.DetachedPublishedProperty.<.ctor>b__1()
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.LazyInitValue()
   at System.Lazy`1.get_Value()
   at Our.Umbraco.DocTypeGridEditor.Models.DetachedPublishedProperty.get_Value()
   at Umbraco.Web.Models.DynamicPublishedContent.TryGetUserProperty(GetMemberBinder binder)
   at Umbraco.Web.Models.DynamicPublishedContent.<>c__DisplayClass9.<TryGetMember>b__6(Func`2 m)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
   at Umbraco.Web.Models.DynamicPublishedContent.TryGetMember(GetMemberBinder binder, Object& result)
   at CallSite.Target(Closure , CallSite , Object )
   at ASP._Page_Views_Partials_GridModules_GridHero_cshtml.Execute()
   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 System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model)
   at ASP._Page_Views_Partials_TypedGrid_renderer_cshtml.Execute()