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.TermDocs() in d:\Lucene.Net\FullRepo\trunk\src\core\Index\SegmentReader.cs:line 1219
   at Lucene.Net.Search.FieldCacheImpl.LongCache.CreateValue(IndexReader reader, Entry entryKey) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\FieldCacheImpl.cs:line 624
   at Lucene.Net.Search.FieldCacheImpl.Cache.Get(IndexReader reader, Entry key) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\FieldCacheImpl.cs:line 238
   at Lucene.Net.Search.FieldCacheImpl.GetLongs(IndexReader reader, String field, LongParser parser) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\FieldCacheImpl.cs:line 598
   at Lucene.Net.Search.FieldCacheImpl.LongCache.CreateValue(IndexReader reader, Entry entryKey) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\FieldCacheImpl.cs:line 620
   at Lucene.Net.Search.FieldCacheImpl.Cache.Get(IndexReader reader, Entry key) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\FieldCacheImpl.cs:line 238
   at Lucene.Net.Search.FieldCacheImpl.GetLongs(IndexReader reader, String field, LongParser parser) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\FieldCacheImpl.cs:line 598
   at Lucene.Net.Search.FieldComparator.LongComparator.SetNextReader(IndexReader reader, Int32 docBase) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\FieldComparator.cs:line 568
   at Lucene.Net.Search.IndexSearcher.Search(Weight weight, Filter filter, Collector collector) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\IndexSearcher.cs:line 238
   at Lucene.Net.Search.IndexSearcher.Search(Weight weight, Filter filter, Int32 nDocs, Sort sort, Boolean fillFields) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\IndexSearcher.cs:line 212
   at Lucene.Net.Search.IndexSearcher.Search(Weight weight, Filter filter, Int32 nDocs, Sort sort) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\IndexSearcher.cs:line 194
   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)