Alliance Darkmoon Faire LUA error

[cabby]

From an email:

While doing the "Darkmoon Faire Quests" (first one "Tan My Hide" which I guess is a skinner only quest) after getting the last skin I got the following error:

Message: [string "_Update() return not not (skill("Cooking")..."]:1: attempt to compare number with string
Time: 01/01/12 13:57:09
Count: 52
Stack: [string "_Update() return not not (skill("Cooking")..."]:1: in function `condition_visible'
Interface\AddOns\ZygorGuidesViewer\Step.lua:129: in function `AreRequirementsMet'
Interface\AddOns\ZygorGuidesViewer\Step.lua:539: in function `GetNextValidStep'
...rface\AddOns\ZygorGuidesViewer\ZygorGuidesViewe r.lua:730: in function `SkipStep'
...rface\AddOns\ZygorGuidesViewer\ZygorGuidesViewe r.lua:920: in function `TryToCompleteStep'
...Ons\ZygorGuidesViewer\Skins\midnight\ViewerFram e.lua:833: in function <...Ons\ZygorGuidesViewer\Skins\midnight\ViewerFra me.lua:641>

Locals: (*temporary) = 0
(*temporary) = "Alchemy"
(*temporary) = "attempt to compare number with string"