Message: Interface/AddOns/MacroToolkit/MacroToolkit.lua line 154:
attempt to index field 'LinkToButton' (a nil value)
Debug:
[string "@Interface/AddOns/MacroToolkit/MacroToolkit.lua"]:154: eventHandler()
[string "@Interface/AddOns/MacroToolkit/modules/initialise.lua"]:15:
Interface/AddOns/MacroToolkit/modules/initialise.lua:15
[string "=[C]"]: LoadAddOn()
[string "@Interface_Wrath/FrameXML/UIParent.lua"]:385: UIParentLoadAddOn()
[string "@Interface_Wrath/FrameXML/UIParent.lua"]:456: TradeSkillFrame_LoadUI()
[string "@Interface_Wrath/FrameXML/UIParent.lua"]:1253:
Interface_Wrath/FrameXML/UIParent.lua:756
[string "=[C]"]: CastSpell()
[string "@Interface/FrameXML/SpellBookFrame.lua"]:363: SpellButton_OnClick()
[string "*SpellBookFrame.xml:163_OnClick"]:4:
[string "*SpellBookFrame.xml:163_OnClick"]:1

I've removed the integration with the tradeskill UI, so this shouldn't give errors anymore