WOW Retail 9.1.5

2x iLvLr\iLvLr-2.4.4.lua:178: Attempt to register unknown event "ITEM_UPGRADE_MASTER_UPDATE"
[string "=[C]"]: in function RegisterEvent' [string "@iLvLr\iLvLr-2.4.4.lua"]:178: in function iLvLrMain'
[string "@iLvLr\iLvLr-2.4.4.lua"]:804: in main chunk

Locals:
(*temporary) = iLvLrFrame {
0 =
}
(*temporary) = "ITEM_UPGRADE_MASTER_UPDATE"

That event got deleted in 9.1.5. Delete line 178 to fix the error.

https://wowpedia.fandom.com/wiki/ITEM_UPGRADE_MASTER_UPDATE

Thanks. Commented it out on line 178 and where it was later referenced. Seems to be working fine.