An error occurred while attaching module (Dynamicweb.Frontend.Content)

Lucene.Net.Store.AlreadyClosedException: this IndexReader is closed
   at Lucene.Net.Index.IndexReader.EnsureOpen() in d:\Lucene.Net\FullRepo\trunk\src\core\Index\IndexReader.cs:line 204
   at Lucene.Net.Index.SegmentReader.Document(Int32 n, FieldSelector fieldSelector) in d:\Lucene.Net\FullRepo\trunk\src\core\Index\SegmentReader.cs:line 1193
   at Dynamicweb.Indexing.Lucene.LuceneIndexProvider.DoSearch(Int32 skip, ScoreDoc[] docs, IndexSearcher searcher, FieldDefinitionBase[] fields)
   at Dynamicweb.Indexing.Lucene.LuceneIndexProvider.SearchInternal(IQuery query, QuerySettings settings)
   at Dynamicweb.Indexing.Querying.QueryService.Query(IQuery query, QuerySettings settings)
   at Dynamicweb.Ecommerce.Indexing.ProductQueryHelper.ExecuteQuery(IQuery query, QuerySettings settings)
   at Dynamicweb.Ecommerce.Indexing.ProductQueryHelper.GetProductsAutoIdsFromIndexQuery(IQuery query, ProductCatalogSettings settings, QuerySettings querySettings, IEnumerable`1& facetViewModel, IEnumerable`1& spellCheckerResult)
   at Dynamicweb.Ecommerce.ProductCatalog.ProductCatalogFrontend.RenderProductList(ProductCatalogSettings settings, QuerySettings querySettings, IQuery query, String groupId, Boolean feed)
   at Dynamicweb.Ecommerce.ProductCatalog.ProductCatalogFrontend.GetContent()
   at Dynamicweb.Frontend.Content.GetModuleOutput(Paragraph paragraph, PageView pageview)