Message: bad argument #1 to '?' (Usage: local depositCost = C_AuctionHouse.CalculateItemDeposit(item, duration, quantity))
Time: Tue Jul 7 07:46:29 2020
Count: 4
Stack: bad argument #1 to '?' (Usage: local depositCost = C_AuctionHouse.CalculateItemDeposit(item, duration, quantity))
[string "=[C]"]: in function CalculateItemDeposit' [string "@Interface\AddOns\Blizzard_AuctionHouseUI\Blizzard_AuctionHouseItemSellFrame.lua"]:302: in function GetDepositAmount'
[string "@interface\AddOns\Blizzard_AuctionHouseUI\Blizzard_AuctionHouseSellFrame.lua"]:487: in function CanPostItem' [string "@Interface\AddOns\Blizzard_AuctionHouseUI\Blizzard_AuctionHouseItemSellFrame.lua"]:327: in function CanPostItem'
[string "@interface\AddOns\Blizzard_AuctionHouseUI\Blizzard_AuctionHouseSellFrame.lua"]:476: in function <...rd_AuctionHouseUI\Blizzard_AuctionHouseSellFrame.lua:475>
[string "=[C]"]: in function UpdatePostButtonState' [string "@Interface\AddOns\Blizzard_AuctionHouseUI\Blizzard_AuctionHouseSellFrame.lua"]:336: in function OnEvent'
[string "@interface\AddOns\Blizzard_AuctionHouseUI\Blizzard_AuctionHouseItemSellFrame.lua"]:85: in function <...uctionHouseUI\Blizzard_AuctionHouseItemSellFrame.lua:84>

Locals: (*temporary) = "bad argument #1 to '?' (Usage: local depositCost = C_AuctionHouse.CalculateItemDeposit(item, duration, quantity))"

This appears to be part of the Sell tab functionality, which has been removed and replaced in the latest alphas. As such this bug will be "fixed" as soon as the new Selling tab leaves alpha.