WowAce

i was in raid ,and i got this

8363x ...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) = -0.002333

I think I've got the same error, it's spamming me up something fierce in the Blizz notifications in chat window until I logged out. I had just come out of a raid too.  The only difference I see at a glance is the last line, which I think may have something to do with positioning of the frame that's tossing errors, if I had a guess. (I'm not well versed in programming). 

1524x ...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>
enabled = true
}
(*temporary) = -81.171171