WowAce

Message: Interface\AddOns\Ace3\AceEvent-3.0\AceEvent-3.0.lua:33: Attempt to register unknown event "AUCTION_ITEM_LIST_UPDATE"
Time: Thu Feb 13 20:11:33 2020
Count: 1
Stack: Interface\AddOns\Ace3\AceEvent-3.0\AceEvent-3.0.lua:33: Attempt to register unknown event "AUCTION_ITEM_LIST_UPDATE"
[string "=[C]"]: in function `RegisterEvent'
[string "@Interface\AddOns\Ace3\AceEvent-3.0\AceEvent-3.0.lua"]:33: in function `OnUsed'
[string "@Interface\AddOns\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua"]:142: in function `RegisterEvent'
[string "@Interface\AddOns\AuctionLite\AuctionLite.lua"]:59: in function <Interface\AddOns\AuctionLite\AuctionLite.lua:46>
[string "=[C]"]: ?
[string "@Interface\AddOns\Ace3\AceAddon-3.0\AceAddon-3.0.lua"]:70: in function <Interface\AddOns\Ace3\AceAddon-3.0\AceAddon-3.0.lua:65>
[string "@Interface\AddOns\Ace3\AceAddon-3.0\AceAddon-3.0.lua"]:498: in function `InitializeAddon'
[string "@Interface\AddOns\Ace3\AceAddon-3.0\AceAddon-3.0.lua"]:613: in function <Interface\AddOns\Ace3\AceAddon-3.0\AceAddon-3.0.lua:605>

Locals: <none>

This is not an Ace3 error, but from an addon using Ace3. In this case, AuctionLite.