What is the nature of the defect?

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

Please post any error messages associated with the defect.
Message: Interface\AddOns\GnomeWorks\GnomeWorks.lua:102 attempt to index field '?' (a nil value)
Time: 06/12/10 12:11:18
Count: 35
Stack: (tail call): ?
Interface\AddOns\GnomeWorks\GnomeWorks.lua:102 in function `?'
...ilo\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:146 in function <...ilo\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:146
[string "safecall Dispatcher[2]"]:4: in function <[string "safecall Dispatcher[2]"]:4>
[C]: ?
[string "safecall Dispatcher[2]"]:13: in function `?'
...ilo\Libs\CallbackHandler-1.0\CallbackHandler-1.0.lua:91 in function `Fire'
...rface\AddOns\Ailo\Libs\AceEvent-3.0\AceEvent-3.0.lua:120 in function <...rface\AddOns\Ailo\Libs\AceEvent-3.0\AceEvent-3.0.lua:119

Locals: (*temporary) = "PLAYER_GUILD_UPDATE"
(*temporary) = "player"
(*temporary) = "PLAYER_GUILD_UPDATE"
(*temporary) = "player"
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = <function> defined =[C]:-1