Message: ...onTools\libs\LibUIDropDownMenu\LibUIDropDownMenu.lua line 223:
attempt to call method 'SetBackdrop' (a nil value)
Debug:
[string "@MythicDungeonTools\libs\LibUIDropDownMenu\LibUIDropDownMenu.lua"]:223: creatre_UIDropDownList()
[string

You should check for updates in that lib

fixed