WowAce

6052x ...ace/AddOns/ShadowedUnitFrames/modules/indicators.lua:276: bad argument #1 to 'SetAlpha' (Usage: self:SetAlpha(alpha))
[string "=[C]"]: in function `SetAlpha'
[string "@Interface/AddOns/ShadowedUnitFrames/modules/indicators.lua"]:276: in function <...ace/AddOns/ShadowedUnitFrames/modules/indicators.lua:270>

Locals:
(*temporary) = Texture {
0 = <userdata>
status = "ready"
enabled = true
}
(*temporary) = -0.00000

Seeing this error a lot, usually right on boss pulls in raids. 

I believe the issue is that the value of self.fadeList[frame] has a negative value. Which pops the SetAlpha call, so the function gets hit over an over on each Update event, and never closes the frame, so it just spams errors over and over. 

frame:SetAlpha(self.fadeList[frame] / FADEOUT_TIME)
if( self.fadeList[frame] <= 0) then 
    self.fadeList[frame] = nil 
    frame:Hide() 
end

Should be

if( self.fadeList[frame] <= 0) then 
    self.fadeList[frame] = nil 
    frame:Hide()
 else
   frame:SetAlpha(self.fadeList[frame] / FADEOUT_TIME)
end