I have corrected the problem (and perfected the query). Could you try this version out?
Thank you for your patience!

Sorry, I forgot to mention you had to save the module before using it again (new values have to be saved). This is why you have the errors. What you need to do:
change the category order to 'none'. Save the module and then re-select the ordering you needed previously. Save.
My apology, wanted to go too fast

I have found a couple other issues in the code. I will get back to you when I have finalized the module. My apologies for this back and forth.

I have fixed the problem I have having with my changes. This has been a major headache... The issue you were having was the tip of the iceberg... By making the version of the module database independent, I had to move a lot of fancy database query code to PHP (sorry about being technical) and that had a ripple effect on everything that had to do with sorting of names and categories. Here is the final version, thank you for your patience.