Sounds like you’re missing a required/master file. It says at the bottom of that mod page that it requires XPMSE & the HDT HighHeels System. So if I had to guess you don’t have HDT HighHeels installed. Check whatever mod tool (MO, LOOT, etc.) you use to see if you’re missing something.
Original URL: https://www.loverslab.com/topic/125201-ctd-after-adding-follower-help/?do=findComment&comment=2673168