NHibernate QueryException:类型不匹配，期望类型==实际类型。

We have this really weird problem in a Web Application when using ActiveRecord 2.0 with NHibernate 2.1.0 (have also tried 2.1.2). I'm sorry if this description is a little vague, but we are having problems understanding exactly what is going on. We are working on a large enterprise application, where we are trying to isolate the problem and make a small example, but we have not accomplished this yet.We have this really weird problem in a Web Appl