I just installed SpartanUI and went to the setup wizard's thir step. Received this error in Swatter:

Date: 2018-09-30 15:22:22
ID: 1
Error occured in: Global
Count: 1
Message: ...rface\AddOns\SpartanUI_Artwork\SpartanUI_Artwork.lua line 338:
attempt to index field '?' (a nil value)
Debug:
...rface\AddOns\SpartanUI_Artwork\SpartanUI_Artwork.lua:338: Display()
SpartanUI\core\SetupWizard.lua:130: DisplayPage()
SpartanUI\core\SetupWizard.lua:102: FindNextPage()
SpartanUI\core\SetupWizard.lua:218:
SpartanUI\core\SetupWizard.lua:206
SpartanUI\core\SetupWizard.lua:241:
SpartanUI\core\SetupWizard.lua:235
Locals:
window = {
0 =
GetChildrenWidgets = defined @interface\AddOns\SpartanUI\libs\StdUi\StdUi.lua:59
SetWindowTitle = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\Window.lua:30
Next = {
}
closeBtn = {
}
StdUi =

{
}
ProgressBar = {
}
SubTitle = {
}
isWidget = true
titlePanel = {
}
Desc1 = {
}
Desc2 = {
}
Status = {
}
Skip = {
}
content = SUI_Window_Content {
}
layoutConfig = {
}
}
SUI_Win = SUI_Window_Content {
WelcomePage = {
}
Artwork = {
}
0 =
ModSelection = {
}
}
StdUi = {
HookDisabledBackdrop = defined @interface\AddOns\SpartanUI\libs\StdUi\StdUi.lua:192
ContextMenuMethods = {
}
GlueAcross = defined @interface\AddOns\SpartanUI\libs\StdUi\StdUiPosition.lua:98
GlueTop = defined @interface\AddOns\SpartanUI\libs\StdUi\StdUiPosition.lua:43
RadioGroup = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\CheckBox.lua:140
moduleVersions = {
}
HighlightButtonTexture = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\Button.lua:69
ScrollBarEvents = {
}
FrameTooltip = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\Tooltip.lua:58
ClearBackdrop = defined @interface\AddOns\SpartanUI\libs\StdUi\StdUi.lua:159
PanelWithTitle = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\Basic.lua:35
ScrollBar = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\Slider.lua:120
Frame = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\Basic.lua:10
Util = {
}
RegisterModule = defined @interface\AddOns\SpartanUI\libs\StdUi\StdUi.lua:36
dialogs = {
}
SetRadioGroupValue = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\CheckBox.lua:161
AddLabel = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\Label.lua:49
Button = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\Button.lua:100
ColorPickerFrame = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\ColorPicker.lua:181
PanelWithLabel = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\Basic.lua:25
GetRadioGroupValue = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\CheckBox.lua:148
ColorInput = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\ColorPicker.lua:211
RegisterWidget = defined @interface\AddOns\SpartanUI\libs\StdUi\StdUi.lua:48
MultiLineBox = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\EditBox.lua:184
Confirm = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\Window.lua:78
config = {
}
ContextMenuEvents = {
}
ContextMenu = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\ContextMenu.lua:198
InitWidget = defined @interface\AddOns\SpartanUI\libs\StdUi\StdUi.lua:56
MoneyBox = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\EditBox.lua:166
SetObjSize = defined @interface\AddOns\SpartanUI\libs\StdUi\StdUi.lua:73
Dialog = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\Window.lua:40
GlueAfter = defined @interface\AddOns\SpartanUI\libs\StdUi\StdUiPosition.lua:79
Label = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\Label.lua:27
ApplyDisabledBackdrop = defined @interface\AddOns\SpartanUI\libs\StdUi\StdUi.lua:163
GlueOpposite = defined @interface\AddOns\SpartanUI\libs\StdUi\StdUiPosition.lua:104
UpgradeNeeded = defined @interface\AddOns\SpartanUI\libs\StdUi\StdUi.lua:40
Slider = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\Slider.lua:74
ButtonAutoWidth = defined @interface\AddOns\SpartanUI\libs\StdUi\widgets\Button.lua:111
SetMargins = defined @interface\AddOns\SpartanUI
AddOns:
Swatter, v8.0.6162 (SwimmingSeadragon)
AllTheThings, v1.7.3b
AucAdvanced, v8.0.6122 (SwimmingSeadragon)
AucFilterBasic, v8.0.6149 (SwimmingSeadragon)
AucStatHistogram, v8.0.6151 (SwimmingSeadragon)
AucStatiLevel, v8.0.6155 (SwimmingSeadragon)
AucStatPurchased, v8.0.6152 (SwimmingSeadragon)
AucStatSimple, v8.0.6153 (SwimmingSeadragon)
AucStatStdDev, v8.0.6154 (SwimmingSeadragon)
AucUtilFixAH, v8.0.6156 (SwimmingSeadragon)
BagBrother, v
Bagnon, v8.0.6
Bartender4, v4.8.1
BeanCounter, v8.0.6157 (SwimmingSeadragon)
DBMArchaeology, v
DBMCore, v8.0.11
DBMDefaultSkin, v
DBMGarrisonInvasions, v
DBMStatusBarTimers, v
Details, v
DetailsDmgRank, v
DetailsDpsTuning, v
DetailsEncounterDetails, v
DetailsRaidCheck, v
DetailsStreamer, v
DetailsTimeAttack, v
DetailsTinyThreat, v
DetailsVanguard, v
Enchantrix, v8.0.6158 (SwimmingSeadragon)
FishingBuddy, v1.9.19
HealBot, v8.0.1.0
HealBotde, v8.0.1.0
HealBotTips, v8.0.1.0
IceHUD, v1.11.6
Informant, v8.0.6159 (SwimmingSeadragon)
KuiMedia, v
KuiNameplates, v
KuiNameplatesCore, v
NPCScan, v8.0.1.13
Pawn, v2.2.28
PetTracker, v8.0.6
PetTrackerBreeds, v8.0.6
PetTrackerJournal, v8.0.6
PetTrackerSwitcher, v8.0.6
PetTrackerUpgrades, v8.0.6
Rarity, v1.0 (r680-release)
RarityOptions, v
Rematch, v4.8.8
SlideBar, v8.0.6160 (SwimmingSeadragon)
SpartanUI, v5.0.4
SpartanUIArtwork, v5.0.4
SpartanUIFilmEffects, v5.0.4
SpartanUIPartyFrames, v5.0.4
SpartanUIPlayerFrames, v5.0.4
SpartanUIRaidFrames, v5.0.4
SpartanUISpinCam, v5.0.4
SpartanUIStyleFel, v5.0.4
SpartanUIStyleMinimal, v5.0.4
SpartanUIStyleTransparent, v5.0.4
SpartanUIStyleWar, v5.0.4
Stubby, v8.0.6161 (SwimmingSeadragon)
TomTom, vv80001-1.0.2
WorldQuestTracker, v
xCT, v4.4.9
BlizRuntimeLib_deDE v8.0.1.80000
(ck=733)