Started yesterday. 11/19 after Blizz update.

104x !Vendorer\core.lua:1877: Usage: GetItemQualityColor(index)
[string "=[C]"]: in function GetItemQualityColor' [string "@!Vendorer\core.lua"]:1877: in function UpdateMerchantInfo'
[string "@!Vendorer\core.lua"]:1801: in function <!Vendorer\core.lua:1801>
[string "=[C]"]: ?
[string "=[C]"]: in function MerchantFrame_UpdateMerchantInfo' [string "@FrameXML\MerchantFrame.lua"]:140: in function <FrameXML\MerchantFrame.lua:133> [string "=[C]"]: in function MerchantFrame_Update'
[string "@!Vendorer\vendorfilter.lua"]:566: in function UpdateMerchantItems' [string "@!Vendorer\vendorfilter.lua"]:612: in function RefreshFilter'
[string "@!Vendorer\vendorfilter.lua"]:572: in function ResetFilter' [string "@!Vendorer\core.lua"]:1728: in function ?'
[string "@ace3\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:119: in function <...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:119>
[string "=[C]"]: ?
[string "@ace3\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:29: in function <...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:25>
[string "@ace3\CallbackHandler-1.0\CallbackHandler-1.0-7.lua"]:64: in function `Fire'
[string "@ace3\AceEvent-3.0\AceEvent-3.0-4.lua"]:120: in function <Ace3\AceEvent-3.0\AceEvent-3.0.lua:119>

Locals:
(*temporary) = nil

Hello, I created a PR addressing all these issues for DragonFlight! From what I tested, the addon is completely functional.
#32.
Feel free to use the code from my fork that is compatible with DF, making the addon functional again, until the author can approve it!

https://github.com/sebid/Vendorer/archive/refs/heads/master.zip

I am also getting this error.