As with any other update, specially if it touches the UI such as this one (due to pack disabler and a new category for skin details in CAS, I think), any mod that modifies or overrides UI related resources is bound to break and needs to be updated. This is the 101 of script and UI mods.
Your error is very likely caused by a UI mod, namely: UI extension cheats, more columns in case, more traits in case, MCC, better build buy, etc. You will need to monitor the broken mods page (this is the old one, new one does not seem to be live yet) and/or try to find the culprit(s) using the 50/50 method.