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

System.NullReferenceException: Object reference not set to an instance of an object.
   at Lucene.Net.Index.SegmentReader.Terms(Term t) in d:\Lucene.Net\FullRepo\trunk\src\core\Index\SegmentReader.cs:line 1181
   at Lucene.Net.Search.NumericRangeQuery`1.NumericRangeTermEnum.Next() in d:\Lucene.Net\FullRepo\trunk\src\core\Search\NumericRangeQuery.cs:line 548
   at Lucene.Net.Search.NumericRangeQuery`1.GetEnum(IndexReader reader) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\NumericRangeQuery.cs:line 203
   at Lucene.Net.Search.MultiTermQuery.ConstantScoreAutoRewrite.Rewrite(IndexReader reader, MultiTermQuery query) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\MultiTermQuery.cs:line 271
   at Lucene.Net.Search.BooleanQuery.Rewrite(IndexReader reader) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\BooleanQuery.cs:line 482
   at Lucene.Net.Search.BooleanQuery.Rewrite(IndexReader reader) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\BooleanQuery.cs:line 482
   at Lucene.Net.Search.BooleanQuery.Rewrite(IndexReader reader) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\BooleanQuery.cs:line 482
   at Lucene.Net.Search.IndexSearcher.Rewrite(Query original) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\IndexSearcher.cs:line 302
   at Lucene.Net.Search.Query.Weight(Searcher searcher) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\Query.cs:line 96
   at Lucene.Net.Search.QueryWrapperFilter.GetDocIdSet(IndexReader reader) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\QueryWrapperFilter.cs:line 85
   at Lucene.Net.Search.IndexSearcher.SearchWithFilter(IndexReader reader, Weight weight, Filter filter, Collector collector) in d:\Lucene.Net\FullRepo\trunk\src\core\Search\IndexSearcher.cs:line 258
   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)