Authors CurseForge

I get this bug while putting out the weed at farm...

Message: Interface\FrameXML\PriestBar.lua:79: Usage: UnitPower("unit"[, type][, unmodified])
Time: 03/25/13 08:55:01
Count: 3
Stack: (tail call): ?
[C]: ?
[C]: in function `UnitPower'
Interface\FrameXML\PriestBar.lua:79: in function `PriestBar_Update'
Interface\FrameXML\PriestBar.lua:63: in function `PriestBarFrame_CheckAndShow'
Interface\FrameXML\PlayerFrame.lua:734: in function `PlayerFrame_HideVehicleTexture'
Interface\FrameXML\PlayerFrame.lua:386: in function `PlayerFrame_ToPlayerArt'
Interface\FrameXML\PlayerFrame.lua:318: in function `PlayerFrame_UpdateArt'
Interface\FrameXML\PlayerFrame.lua:241: in function `OnEvent'
Interface\FrameXML\UnitFrame.lua:563: in function <Interface\FrameXML\UnitFrame.lua:561>

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