I'm getting the following error:

System.InvalidCastException occurred
  Message=Unable to cast object of type
'AEGISweb.Data.Entities.TechSupportCallback' to type
'System.Object[]'.
  Source=NHibernate
  StackTrace:
       at NHibernate.Cache.StandardQueryCache.Put(QueryKey key,
ICacheAssembler[] returnTypes, IList result, Boolean
isNaturalKeyLookup, ISessionImplementor session)
  InnerException:

with a query + projection like:

// open session & transaction in using (..)
// only return the properties we want!
var query = session.CreateCriteria<TechSupportCallback>()
  .SetCacheable(true)
  .SetCacheRegion("CallbacksByUserAndGroups")
  .SetProjection(Projections.ProjectionList()
      .Add(Projections.Alias(Projections.Id(), ex.NameOf(x =>
x.ID))) //
      .Add(Projections.Alias(Projections.Property(ex.NameOf(x =>
x.ContactID)), ex.NameOf(x => x.ContactID)))
      // ...
   )
   .SetResultTra...;
   rValue = query.List<TechSupportCallback>();

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