Once upon a time I played with SIXX. I don't remember what the sticking 
point was, but it didn't become anything that I use all the time (though I 
would like to go back get up to speed on this!). In fact, SIXX has pretty 
much disappeared from my Squeak radar screen in terms of what I'm doing 
from day to day. I have a group of projects I'm trying to move from Squeak 
3.6 to 3.8. Most of them are now working fine, but I have just *ONE* that 
has some stray reference to SIXX based on something I did once upon a time 
that I've now forgotten about. If I load SIXX into Squeak 3.8, the project 
loads, so if I have to I can simply do that, but I'd like to cut loose from 
the SIXX dependency until I really get up to speed on SIXX and decide I 
really need it.

So how do I get rid of this dependency. When I just try loading the project 
into Squeak 3.8, without doing anything about SIXX, I get a walkback saying

Error: Global "SixxMockClassForUnitTest" not found

I've tried deleting all instances of all the SIXX classes -- this doesn't 
help.

I tried removing the SIXX classes from the 3.6 image. This produced no 
error message, but when I tried to save the project I got a PopUpMenu 
inform message "extra associations". Then when I said OK I got a walkback 
saying

Error: Trying to write out, AnObsoleteSixxXmlUtil

So, it appears I have a "stray association" that I would like to purge. Any 
words of wisdom out there on how to do this?

-Thanks, Jim