[Pharo-project] Problem with de Traits

Hi Folks.. I have the following method classesIncluded | includes | includes := OrderedCollection new. TSSerosDB users do:[ :aClass | self processClass: aClass into: includes ]. ^ includes. TSSerosDB is a Trait.. Well when I run the process, I get a MNU.. reciver of users is nil But If I inspect "TSSerosDB users", i get a Identity Set... What's wrong.. why the debugger get something different to another process Thanks in advance..