Erreur Mono UI

Message: ...ace\AddOns\m_UI\elements\modules\tooltip_spellID.lua:44: attempt to index global 'ItemRefShoppingTooltip3' (a nil value)
Time: 10/26/14 17:24:49
Count: 1
Stack: ...ace\AddOns\m_UI\elements\modules\tooltip_spellID.lua:44: in main chunk

Locals: addon = "m_UI"
ns = <table> {
 cfg = <unnamed> {
 }
 A = <unnamed> {
 }
}
cfg = <unnamed> {
 modules = <table> {
 }
 script = <table> {
 }
 media = <table> {
 }
 skins = <table> {
 }
 show_timer = true
 automation = <table> {
 }
 0 = <userdata>
}
select = <function> defined =[C]:-1
UnitAura = <function> defined =[C]:-1
tonumber = <function> defined =[C]:-1
strfind = <function> defined =[C]:-1
hooksecurefunc = <function> defined =[C]:-1
addLine = <function> defined @Interface\AddOns\m_UI\elements\modules\tooltip_spellID.lua:7
attachItemTooltip = <function> defined @Interface\AddOns\m_UI\elements\modules\tooltip_spellID.lua:34
(*temporary) = nil
(*temporary) = nil
(*temporary) = "OnTooltipSetItem"
(*temporary) = <function> defined @Interface\AddOns\m_UI\elements\modules\tooltip_spellID.lua:34
(*temporary) = "attempt to index global 'ItemRefShoppingTooltip3' (a nil value)"