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

System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
at System.Reflection.RuntimeModule.GetTypes()
at System.Reflection.Assembly.GetTypes()
at Dynamicweb.Indexing.Lucene.Analyzers.AnalyzerFactory.<>c.b__9_0(Assembly x)
at System.Linq.Enumerable.d__17`2.MoveNext()
at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
at Dynamicweb.Indexing.Lucene.Analyzers.AnalyzerFactory.LoadCreators()
at Dynamicweb.Indexing.Lucene.Analyzers.AnalyzerFactory.get_Instance()
at Dynamicweb.Indexing.Lucene.Helpers.GetAnalyzer(IIndex index, String providerTypeName)
at Dynamicweb.Indexing.Lucene.Helpers.ParseQueryExpression(IIndex index, Expression expression, QuerySettings settings)
at Dynamicweb.Indexing.Lucene.LuceneIndexProvider.SearchInternal(IQuery query, QuerySettings settings)
at Dynamicweb.Indexing.Lucene.LuceneIndexProvider.Query(IQuery query, QuerySettings settings)
at Dynamicweb.Indexing.Queries.IndexQueryProvider.Query(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)