NHibernate.HibernateException: The dialect was not set. Set the property hibernate.dialect.
    on NHibernate.Dialect.Dialect.GetDialect()
    on NHibernate.Dialect.Dialect.GetDialect(IDictionary props)
    on Orm.PersistentManager.ResolveNativeIDGenerators()
    on Orm.PersistentManager..ctor(DotNetConnectionSetting connectionSetting, SessionType sessionType)
    on Persistencia.EvalModelSystemOrmPersistentManager..ctor()
    on Persistencia.EvalModelSystemOrmPersistentManager.Instance()
    on Persistencia.ModeloFactory.LoadModeloByORMID(Int32 ID)
    on EvalModelService.CrearModeloPrueba() en d:\Visual Studio 2005\Projects\EvalModelProject\EvalModelWebService\App_Code\EvalModelService.cs:línea 63
 

       try
         {
             bool aux = modelo.Save();            
         }
         catch (Exception ex)
         {
             ex.ToString();
         }