this shows every time i log in

Count: 1
Message: Interface/AddOns/Details_Elitism/Core.lua line 743:
Usage: SecureHook([object], method, [handler]): Attempting to hook a non existing target
Debug:
[string "=(tail call)"]: ?
[string "=(tail call)"]: ?
[string "=[C]"]: ?
[string "=[C]"]: ?
[string "@Interface/AddOns/Ace3/AceHook-3.0/AceHook-3.0.lua"]:210:
Interface/AddOns/Ace3/AceHook-3.0/AceHook-3.0.lua:118
[string "@Interface/AddOns/Ace3/AceHook-3.0/AceHook-3.0.lua"]:340: SecureHook()
[string "@Interface/AddOns/Details_Elitism/Core.lua"]:743:
Interface/AddOns/Details_Elitism/Core.lua:738
[string "=(tail call)"]: ?
[string "=[C]"]: StartMeUp()
[string "@Interface/AddOns/Details/core/parser.lua"]:5753:
Interface/AddOns/Details/core/parser.lua:5752
Locals:
(*temporary) = defined =[C]:-1

Can concur. I'm getting this error as well and the Plugin doesn't show anything anymore when I run keys. Has been working perfectly for forever and I'd appreciate if someone can point to a fix. I checked if I had Ace3 missing or anything like that but I have the newest version installed.

EDIT: Sorry, I retract my comment. Installing Ace3 seems to have fixed the problem.