Check out my code for my UI. Basically the names were changed.
https://github.com/Kkthnx/KkthnxUI_L...s/CastBars.lua
So instead of
Code:
CastingBarFrameBorder:SetTexture("Interface\\CastingBar\\UI-CastingBar-Border-Small")
its now
Code:
CastingBarFrame.Border:SetTexture("Interface\\CastingBar\\UI-CastingBar-Border-Small")