What steps will reproduce the problem?

1. Set Bars Style to "TukUI"
2. Create Test Bars

What version of BigWigs are you using? (Stating 'latest' is not useful)

v185.1

Do you have an error log of what happened?

20x BigWigs_Plugins\Bars.lua:340: attempt to call method 'SetBackdrop' (a nil value)
[string "@BigWigs_Plugins\Bars.lua"]:340: in function ApplyStyle' [string "@BigWigs_Plugins\Bars.lua"]:2025: in function ?'
[string "@BigWigs\Loader.lua"]:967: in function SendMessage' [string "@BigWigs_Core\Core.lua"]:260: in function <BigWigs_Core\Core.lua:242> [string "=[C]"]: ? [string "@Ace3\AceGUI-3.0\AceGUI-3.0-41.lua"]:72: in function <Ace3\AceGUI-3.0\AceGUI-3.0.lua:70> [string "@Ace3\AceGUI-3.0\AceGUI-3.0-41.lua"]:306: in function Fire'
[string "@ace3\AceGUI-3.0-41\widgets\AceGUIWidget-Button.lua"]:22: in function <...dOns\Ace3\AceGUI-3.0\widgets\AceGUIWidget-Button.lua:19>

Any additional information? (example: WoW language if not English) (Attach screenshots here if available, do not link externally)

Thanks for the report!