In order addonto work Scripts---> localization.lua
local LightName = "LightName"
local DarkName = "DarkName"
change the "LightName" "DarkName" to the buffs name in your language for example for TR EU
local LightName = "Işık'a Uzanış"
local DarkName = "Karanlık'a Uzanış"
do those fix and it should be working fine
The names are from 11.0 patch.