거래창에 제가 배운 마법부여 매크로 링크하고 싶습니다.

/run SendChatMessage(C_TradeSkillUI.GetRecipeLink(28029), "say") 
위에건 아래 오류가 뜨네요

Message: [string "SendChatMessage(select(2,GetSpellLink(28029..."]:1: attempt to concatenate a nil value
Time: Wed May 26 16:39:57 2021
Count: 1
Stack: [string "SendChatMessage(select(2,GetSpellLink(28029..."]:1: attempt to concatenate a nil value
[string "SendChatMessage(select(2,GetSpellLink(28029)) .. "메세지","CHANNEL",nil,GetChannelName("2"))"]:1: in main chunk
[string "=[C]"]: in function `RunScript'
[string "@InterfaceFrameXMLChatFrame.lua"]:2160: in function `?'
[string "@InterfaceFrameXMLChatFrame.lua"]:4825: in function `ChatEdit_ParseText'
[string "@InterfaceFrameXMLChatFrame.lua"]:4488: in function `ChatEdit_SendText'
[string "@InterfaceFrameXMLChatFrame.lua"]:4524: in function `ChatEdit_OnEnterPressed'
[string "*:OnEnterPressed"]:1: in function <[string "*:OnEnterPressed"]:1>

Locals: (*temporary) = <function> defined =[C]:-1
(*temporary) = nil
(*temporary) = "메세지"
(*temporary) = "[마법부여]"
(*temporary) = nil
(*temporary) = "[마법부여]"
(*temporary) = "attempt to concatenate a nil value"


/run SendChatMessage(select(2,GetSpellLink(28029)) .. "메세지","CHANNEL",nil,GetChannelName("2"))

이 두 매크로 오류 뜨던데 왜 뜨는건가요? 도와주세요