Lua error when targeting

[bepposax]

Hi, this is the error i get when I target any character:

Message: Interface\AddOns\ClassMods\modules\targetbar.lua:26: attempt to index field '?' (a nil value)
Time: Mon Sep 10 12:33:19 2018
Count: 161
Stack: Interface\AddOns\ClassMods\modules\targetbar.lua:26: attempt to index field '?' (a nil value)
Interface\AddOns\ClassMods\modules\targetbar.lua:26: in function <Interface\AddOns\ClassMods\modules\targetbar.lua:8>
Interface\AddOns\ClassMods\modules\targetbar.lua:333: in function <Interface\AddOns\ClassMods\modules\targetbar.lua:306>

Locals: incPrediction = 0
health = 108840
maxHealth = 108840
barColor = <table> {
 1 = 0
 2 = 1
 3 = 0
 4 = 1
}
targetClass = 3
(*temporary) = <table> {
}
(*temporary) = nil
(*temporary) = 3
(*temporary) = "HUNTER"
(*temporary) = 3
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to index field '?' (a nil value)"
UnitHealth = <function> defined =[C]:-1
UnitHealthMax = <function> defined =[C]:-1