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It looks to me like Line 326 of nUI_UnitAura (the one apparently generating the warning) could be commented out without affecting anything else.
All it does is call Frame:SetID on one of the aura slots.
Frame:SetID just associates an integer value (essentially a tag or user index) with a frame, which can be retrieved with Frame:GetID. The ID assigned has no effect on the frame's behavior (which makes one wonder why calling SetID should be protected...).
In any case, there are no corresponding calls that I can find to Frame:GetID on the aura slots in question, so the ID number assigned on line 326 is "write-only" and serves no purpose.
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