I have implemented a custom Examine search in my Umbraco 4.7.0 site

When i do this:


Dim Searcher = ExamineManager.Instance.SearchProviderCollection("WebsiteSearcher")
Dim searchCriteria = Searcher.CreateSearchCriteria(BooleanOperation.Or)
Dim query = searchCriteria.RawQuery(q)
Dim sRes = Searcher.Search(query)

everything works fine


But if i try to sort by updatedate like this:


Dim Searcher = ExamineManager.Instance.SearchProviderCollection("WebsiteSearcher")
Dim searchCriteria = Searcher.CreateSearchCriteria(BooleanOperation.Or)
Dim query = searchCriteria.RawQuery(q).OrderByDescending("updateDate")
Dim sRes = Searcher.Search(query)

I get this exception:

Unable to cast object of type 'Examine.LuceneEngine.SearchCriteria.LuceneBooleanOperation' to type 'Examine.SearchCriteria.ISearchCriteria'.


Can anyone explain what i'm doing wrong, and how to do the sort in the correct way.

Thanks

Mikael