Please include as much of the following information as possible to help me fix the bug:

Brief Description of Bug

Lua error on login with version 10.1.2-2-g028f2ed

Steps to Reproduce

Login. Low level characters in Orgrimmar didn't tickle this bug but my level 60 DK in The Seer's Library on the Scryer's Tier did.

Loaded Addons

Lots. I'll figure out how to automagically generate this list if it is really needed.

Back Trace (LUA Error Output)

24x ...Ons/Auctionator/Source/Config/Mixins/PanelConfig.lua:22: attempt to call field 'GetCategory' (a nil value)
[string "@Auctionator/Source/Config/Mixins/PanelConfig.lua"]:22: in function SetupPanel' [string "@Auctionator/Source_Classic/Config/Mixins/BasicOptions.lua"]:9: in function <...onator/Source_Classic/Config/Mixins/BasicOptions.lua:3> [string "=[C]"]: ? [string "=[C]"]: in function CreateFrame'
[string "@Auctionator/Source/Config/InitializeFrames.lua"]:3: in function InternalInitializeFrames' [string "@Auctionator/Source_Classic/Config/InitializeFrames.lua"]:2: in function InitializeFrames'
[string "@Auctionator/Source/Variables/Main.lua"]:9: in function Initialize' [string "@Auctionator/Source/Initialize/Main.lua"]:30: in function AddonDataLoaded'
[string "@Auctionator/Source/Initialize/Main.lua"]:20: in function <Auctionator/Source/Initialize/Main.lua:17>

Locals:
self = AuctionatorConfigBasicOptionsFrame {
0 =
cancel = defined @Auctionator/Source/Config/Mixins/PanelConfig.lua:4
ShowCraftingCost = Frame {
}
parent = "Auctionator"
Save = defined @Auctionator/Source_Classic/Config/Mixins/BasicOptions.lua:19
ShowCraftingProfit = Frame {
}
OnDefault = defined @Auctionator/Source/Config/Mixins/PanelConfig.lua:13
SetupPanel = defined @Auctionator/Source/Config/Mixins/PanelConfig.lua:3
DefaultTab = Frame {
}
OnShow = defined @Auctionator/Source_Classic/Config/Mixins/BasicOptions.lua:12
CraftingInfoHeading = Frame {
}
OnRefresh = defined @Auctionator/Source/Config/Mixins/PanelConfig.lua:14
TitleArea = Frame {
}
Cancel = defined @Auctionator/Source_Classic/Config/Mixins/BasicOptions.lua:28
name = "Basic Options"
okay = defined @Auctionator/Source/Config/Mixins/PanelConfig.lua:8
ShowCraftingInfo = Frame {
}
OnCommit = defined @Auctionator/Source/Config/Mixins/PanelConfig.lua:8
OnLoad = defined @Auctionator/Source_Classic/Config/Mixins/BasicOptions.lua:3
DefaultTabHeading = Frame {
}
}
(*temporary) = nil
(*temporary) = "Auctionator"
(*temporary) = "attempt to call field 'GetCategory' (a nil value)"

List of Addons (enabled == loaded) AddOns.txt

This is caused by another addon creating a global Settings object. Added a temporary fix.

That other addon would be Profession Master - Guild Trade Skills.