This happens when you have instances of the class and the class doesn't exists anymore.

"Smalltalk fixObsoleteReferences" didn't completely work for me when i had that problem, i had to find out where those references were.

I think looking for strong pointers of the ObsoleteClass would be a good start.

2013/6/3 Andres Valloud <avalloud@smalltalk.comcastbiz.net>

Maybe they have instances. �GC can't remove a class under its instances.

On 6/3/13 2:14 , Gisela Decuzzi wrote:

Hi, I'm trying to fix this, I have Obsolete classes in the system and I
want to remove them, as long as I understood this is because this
classes are gone and in some point someone is referencing them.

I do an extended search an get nothing, but still the obsolete classes
are there... I don't find no one with references to it but if I run:
SystemNavigation new obsoleteClassesselect: [ :each | each isAnonymous

not ]
I get the problem classes.

I found this thread about a similar issue but don't know how to solve
the problem
http://lists.gforge.inria.fr/pipermail/pharo-project/2011-January/038824.html

Maybe someone could help me...