TBC: bad argument #1 to 'gsub' (string expected, got nil)

[mrogaski]

Date: 2021-09-03 22:01:47
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\GreenWall\Config.lua line 137:
   bad argument #1 to 'gsub' (string expected, got nil)
Debug:
   [string "=[C]"]: gsub()
   [string "@GreenWall\Config.lua"]:137: substitute()
   [string "@GreenWall\Config.lua"]:218: load()
   [string "@GreenWall\GreenWall.lua"]:375: GreenWall_OnEvent()
   [string "*:OnEvent"]:1:
      [string "*:OnEvent"]:1
Locals:
(*temporary) = nil
(*temporary) = "%$(%a)"
(*temporary) = <function> defined @Interface\AddOns\GreenWall\Config.lua:137
(*temporary) = "string expected, got nil"

AddOns:
  Swatter, v1.13.6652 (SwimmingSeadragon)
  AucAdvanced, v1.13.6717 (SwimmingSeadragon)
  AucFilterBasic, v1.13.6680 (SwimmingSeadragon)
  AucStatHistogram, v1.13.6681 (SwimmingSeadragon)
  AucStatiLevel, v1.13.6705 (SwimmingSeadragon)
  AucStatPurchased, v1.13.6672 (SwimmingSeadragon)
  AucStatSimple, v1.13.6634 (SwimmingSeadragon)
  AucStatStdDev, v1.13.6635 (SwimmingSeadragon)
  AucUtilFixAH, v1.13.6608 (SwimmingSeadragon)
  BeanCounter, v1.13.6682 (SwimmingSeadragon)
  GreenWall, v1.11.6+classic
  Informant, v1.13.6684 (SwimmingSeadragon)
  SlideBar, v1.13.6668 (SwimmingSeadragon)
  Stubby, v1.13.6614 (SwimmingSeadragon)
  BlizRuntimeLib_enUS v2.5.2.20502 <none>
  (ck=2a3)

[mrogaski]

This is being raised when the following line is parsed:

GWp:Scrubs R Us

There's a missing alias field.