SKINS [CUSTOM_LFD]: @(01/01/19 04:49:28) - ...erface\AddOns\SVUI_Skins\components\blizzard\lfd.lua:185: attempt to index global 'PVEFrameTitleBg' (a nil value)

The line it's referencing is in bold.
I've tried a couple of minor changes but I don't know LUA so I don't want to try a manual fix.

LFGDungeonReadyDialog:RemoveTextures()
LFGDungeonReadyDialog:SetStyle("Frame", "Pattern", true, 2, 4, 4)

PVEFrameLeftInset:RemoveTextures()
RaidFinderQueueFrame:RemoveTextures(true)
PVEFrameBg:Hide()
PVEFrameTitleBg:Hide()
PVEFramePortrait:Hide()
PVEFramePortraitFrame:Hide()
PVEFrameTopRightCorner:Hide()
PVEFrameTopBorder:Hide()
PVEFrameLeftInsetBg:Hide()
PVEFrame.shadows:Hide()
PVEFrame:EnableMouse(false)

This bug has been fixed and is awaiting a merge.

Fixed