WowAce

What steps will reproduce the problem?
1. Error appears on login

What is the expected output? What do you see instead?
Error on login.  Addon features unresponsive afterwards.

What version of the product are you using?
Latest (3.2.0.12)

Do you have an error log of what happened?
Date: 2010-10-18 21:07:49
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\FSwapper3\FSwapper3.lua line 420:
   attempt to call global 'GetNumSkillLines' (a nil value)
Debug:
   (tail call): ?
   FSwapper3\FSwapper3.lua:420: UpdateSkill()
   FSwapper3\DataBroker.lua:21: DoDBUpdate()
   FSwapper3\FSwapper3.lua:275: SetWeapons()
   FSwapper3\FSwapper3.lua:189:
      FSwapper3\FSwapper3.lua:101
   (tail call): ?
   [C]: ?
   [string "safecall Dispatcher[1]"]:9:
      [string "safecall Dispatcher[1]"]:5
   (tail call): ?
   ...ns\A3Fu_Infoclock\Libs\AceAddon-3.0\AceAddon-3.0.lua:539: EnableAddon()
   ...ns\A3Fu_Infoclock\Libs\AceAddon-3.0\AceAddon-3.0.lua:629:
      ...ns\A3Fu_Infoclock\Libs\AceAddon-3.0\AceAddon-3.0.lua:615
   [C]: LoadAddOn()
   ..\FrameXML\UIParent.lua:242: UIParentLoadAddOn()
   ..\FrameXML\UIParent.lua:265: CombatLog_LoadUI()
   ..\FrameXML\UIParent.lua:519:
      ..\FrameXML\UIParent.lua:492

Please provide any additional information below.
I know it hasn't been updated in a while but I like this addon.  Someone please fix!  Thanks!  :-)

Unfortunately Blizzard has directly killed this type of addon quite a few patches ago. It can only work in a very clunky and unintuitive kind of setup which would be very limited compared to its original intended functionality.