WoWInterface - [Error] nButtons

Need help! :<

Quote:

Message: Interface\AddOns\nButtons\nButtons.lua:142: attempt to index field 'InspectModelFrameRotateLeftButton' (a nil value)
Time: 12/17/11 01:37:45
Count: 1
Stack: Interface\AddOns\nButtons\nButtons.lua:142: in function <Interface\AddOns\nButtons\nButtons.lua:6>
[C]: in function `LoadAddOn'
Interface\FrameXML\UIParent.lua:274: in function `UIParentLoadAddOn'
Interface\FrameXML\UIParent.lua:305: in function `InspectFrame_LoadUI'
Interface\FrameXML\UIParent.lua:574: in function `InspectUnit'
Interface\FrameXML\UnitPopup.lua:1322: in function <Interface\FrameXML\UnitPopup.lua:1289>
[C]: in function `func'
Interface\FrameXML\UIDropDownMenu.lua:706: in function `UIDropDownMenuButton_OnClick'
[string "*:OnClick"]:1: in function <[string "*:OnClick"]:1>

Locals: self = <unnamed> {
0 = <userdata>
}
event = "ADDON_LOADED"
AddOn = "Blizzard_InspectUI"
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to index field 'InspectModelFrameRotateLeftButton' (a nil value)"