What is the nature of the defect?
Error

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

Please post any error messages associated with the defect.
Message: Interface\AddOns\GnomeWorks\Inventory.lua:21 attempt to compare number with nil
Time: 06/15/10 21:58:39
Count: 4
Stack: [C]: ?
Interface\AddOns\GnomeWorks\Inventory.lua:21 in function `VendorSellsItem'
Interface\AddOns\GnomeWorks\Inventory.lua:170 in function `GetInventoryCount'
Interface\AddOns\GnomeWorks\MainWindow.lua:990 in function `func'
Interface\AddOns\GnomeWorks\ScrollFrame.lua:373 in function <Interface\AddOns\GnomeWorks\ScrollFrame.lua:352
Interface\AddOns\GnomeWorks\ScrollFrame.lua:368 in function `UpdateData'
Interface\AddOns\GnomeWorks\ScrollFrame.lua:384 in function `RefreshRows'
Interface\AddOns\GnomeWorks\ScrollFrame.lua:847 in function `Refresh'
Interface\AddOns\GnomeWorks\plugins\lsw.lua:380 in function `RefreshWindow'
...ace\AddOns\LilSparkysWorkshop\lilsparkysworkshop.lua:1238 in function `triggerFunction'
...ace\AddOns\LilSparkysWorkshop\lilsparkysworkshop.lua:2182 in function <...ace\AddOns\LilSparkysWorkshop\lilsparkysworkshop.lua:2174

Locals: