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.IndexReader.Document(Int32 n) in d:\Lucene.Net\FullRepo\trunk\src\core\Index\IndexReader.cs:line 732
   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.QueryPublisher.Frontend.GetContent()
   at Dynamicweb.Frontend.Content.GetModuleOutput(Paragraph paragraph, PageView pageview)