Kui_Nameplates\elements/highlight.lua:35: Usage: UnitIsUnit("unit", "otherUnit")
[C]: in function UnitIsUnit' Kui_Nameplates\elements/highlight.lua:35: in functionHighlightShow'
Kui_Nameplates\elements/highlight.lua:81: in function `func'
Kui_Nameplates\messages.lua:81: in function <Kui_Nameplates\messages.lua:44>

Locals:

This happened when fighting lich king in ICC