What (if anything) triggers the defect?  (happens when loading, when activating the mod, when clicking a particular button, etc)
open blacksmithing

Please post any error messages associated with the defect.
Message: Interface\AddOns\GnomeWorks\GetTradeSkill.lua:104 attempt to compare nil with number
Time: 06/17/10 23:25:58
Count: 19
Stack: [C]: ?
Interface\AddOns\GnomeWorks\GetTradeSkill.lua:104 in function <Interface\AddOns\GnomeWorks\GetTradeSkill.lua:101
(tail call): ?
Interface\AddOns\GnomeWorks\plugins\lsw.lua:423 in function `GetTradeSkillData'
...ace\AddOns\LilSparkysWorkshop\lilsparkysworkshop.lua:1451 in function `SkillButtonShow'
...Ons\LilSparkysWorkshop\frameSupport\atsw_support.lua:23 in function <...Ons\LilSparkysWorkshop\frameSupport\atsw_support.lua:23
[C]: in function `Show'
Interface\AddOns\AdvancedTradeSkillWindow\atsw.lua:734 in function <Interface\AddOns\AdvancedTradeSkillWindow\atsw.lua:643
[C]: ?
...Ons\LilSparkysWorkshop\frameSupport\atsw_support.lua:42 in function `ATSWFrame_Update'
Interface\AddOns\AdvancedTradeSkillWindow\atsw.lua:481 in function `ATSWFrame_OnEvent'
[string "*:OnEvent"]:1: in function <[string "*:OnEvent"]:1>
[C]: in function `ExpandTradeSkillSubClass'
Interface\AddOns\AdvancedTradeSkillWindow\atsw.lua:130 in function <Interface\AddOns\AdvancedTradeSkillWindow\atsw.lua:115
...Ons\LilSparkysWorkshop\frameSupport\atsw_support.lua:58 in function `ATSW_ShowWindow'
Interface\AddOns\AdvancedTradeSkillWindow\atsw.lua:372 in function `ATSWFrame_OnEvent'
[string "*:OnEvent"]:1: in function <[string "*:OnEvent"]:1>
[C]: ?
[C]: in function `UseAction'
Interface\FrameXML\SecureTemplates.lua:310 in function `handler'
Interface\FrameXML\SecureTemplates.lua:529 in function <Interface\FrameXML\SecureTemplates.lua:478

Locals: