2x ConvertRatings\ConvertRatings-1.8.lua:142: Usage: GetItemInfo(itemID|"name"|"itemlink")
[C]: in function GetItemInfo' ConvertRatings\ConvertRatings-1.8.lua:142: in function <ConvertRatings\ConvertRatings.lua:114> [C]: ? ...rfaceTradeSkillMaster\Private\TooltipLib.lua:85: in function <...rfaceTradeSkillMaster\Private\TooltipLib.lua:82> [C]: ? [C]: ? ...rfaceTradeSkillMaster\Private\TooltipLib.lua:95: in function SetAuctionSellItem'
Auctionator\Auctionator-4.0.16.lua:1218: in function Atr_GetSellItemInfo' Auctionator\Auctionator-4.0.16.lua:3112: in function Atr_SetDepositText'
Auctionator\Auctionator-4.0.16.lua:3072: in function Atr_UpdateUI_SellPane' Auctionator\Auctionator-4.0.16.lua:3009: in function Atr_UpdateUI'
Auctionator\Auctionator-4.0.16.lua:2847: in function Atr_Idle' Auctionator\Auctionator-4.0.16.lua:2796: in function Atr_OnUpdate'
[string ":OnUpdate"]:1: in function <[string ":OnUpdate"]:1>

Locals:
(*temporary) = nil

i opened up the auction house, and did a bunch of searches for various items and got no errors.

It looks like you have another addon contributing to this error, I can't really tell what addon since the name got cut off in your post, but it looks like TradeSkillMaster or one of its plugins.

If you have that installed, disable it and see if the error persists and report back

Since I have not received any follow-up, I am going to assume that the error was caused by the additional addon and will be closing this issue.