After Weakauras 4.0 update when you open WA option window..

1x ..._WindTools\Modules\Skins\Addons\WeakAurasOptions-4.0.0.lua:648: attempt to index field 'WeakAurasTooltipImportButton' (a nil value)
[string "@ElvUI_WindTools\Modules\Skins\Addons\WeakAurasOptions-4.0.0.lua"]:648: in function <..._WindTools\Modules\Skins\Addons\WeakAurasOptions.lua:483>
[string "=(tail call)"]: ?
[string "=[C]"]: in function ShowOptions' [string "@WeakAurasOptions\WeakAurasOptions-4.0.0.lua"]:625: in function ToggleOptions'
[string "@WeakAuras\WeakAuras-4.0.0.lua"]:106: in function OpenOptions' [string "@WeakAuras\WeakAuras-4.0.0.lua"]:153: in function ?'
[string "@FrameXML\ChatFrame.lua"]:5185: in function ChatEdit_ParseText' [string "@FrameXML\ChatFrame.lua"]:4849: in function ChatEdit_SendText'
[string "@FrameXML\ChatFrame.lua"]:4885: in function <FrameXML\ChatFrame.lua:4881>
[string "=[C]"]: in function `ChatEdit_OnEnterPressed'
[string ":OnEnterPressed"]:1: in function <[string ":OnEnterPressed"]:1>

Locals:
self =

{
Blizzard_Channels = defined @ElvUI_WindTools\Modules\Skins\Blizzard\Channels.lua:6
WeakAuras_ShowOptions = defined @ElvUI_WindTools\Modules\Skins\Addons\WeakAurasOptions.lua:483
ElvUI_AFK = defined @ElvUI_WindTools\Modules\Skins\ElvUI\AFK.lua:7
modules = {
}
CancelTimer = defined @ace3\AceTimer-3.0\AceTimer-3.0.lua:147
GuildInviteFrame = defined @ElvUI_WindTools\Modules\Skins\Blizzard\Guild.lua:6
ElvUI_UnitFrames_Configure_Threat = defined @ElvUI_WindTools\Modules\Skins\ElvUI\UnitFrames.lua:23
SkinCriteriaAlert = defined @ElvUI_WindTools\Modules\Skins\Blizzard\Alerts.lua:63
RaidUtility_ShowButton_OnClick = defined @ElvUI_WindTools\Modules\Skins\ElvUI\RaidUtility.lua:9
Blizzard_LossOfControlFrame_SetUpDisplay = defined @ElvUI_WindTools\Modules\Skins\Blizzard\LossOfControl.lua:6
Blizzard_WeeklyRewards = defined @ElvUI_WindTools\Modules\Skins\Blizzard\WeeklyRewards.lua:6
Blizzard_PlayerChoice = defined @ElvUI_WindTools\Modules\Skins\Blizzard\PlayerChoice.lua:35
SkinItemButton = defined @ElvUI_WindTools\Modules\Skins\Blizzard\ObjectiveTracker.lua:24
ADDON_LOADED = defined @ElvUI_WindTools\Modules\Skins\Core.lua:273
WeakAurasIconButton = defined @ElvUI_WindTools\Modules\Skins\Addons\WeakAurasOptions.lua:441
ElvUI_CastBars = defined @ElvUI_WindTools\Modules\Skins\ElvUI\CastBars.lua:59
ElvUI_SkinOptionsUI = defined @ElvUI_WindTools\Modules\Skins\ElvUI\Option.lua:7
SetEnabledState = defined @ace3\AceAddon-3.0\AceAddon-3.0.lua:424
Hook = defined @ace3\AceHook-3.0\AceHook-3.0.lua:274
enteredLoad = {
}
DressUpFrame = defined @ElvUI_WindTools\Modules\Skins\Blizzard\DressingRoom.lua:6
TomCats_HeaderCollapseButton_SetNormalAtlas = defined @ElvUI_WindTools\Modules\Skins\Addons\TomCats.lua:59
BigWigs_Plugins = defined @ElvUI_WindTools\Modules\Skins\Addons\BigWigs.lua:22
Blizzard_AnimaDiversionUI = defined @ElvUI_WindTools\Modules\Skins\Blizzard\AnimaDiversion.lua:6
AAP_SkinOrderList = defined @ElvUI_WindTools\Modules\Skins\Addons\AzerothAutoPilot.lua:11
UnregisterAllEvents = defined @ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:174
ElvUI_UnitFrames_Construct_AuraBars = defined @ElvUI_WindTools\Modules\Skins\ElvUI\UnitFrames.lua:76
SkinWorldQuestCompleteAlert = defined @ElvUI_WindTools\Modules\Skins\Blizzard\Alerts.lua:174
WeakAuras = defined @ElvUI_WindTools\Modules\Skins\Addons\WeakAuras.lua:177
Blizzard_Calendar = defined @ElvUI_WindTools\Modules\Skins\Blizzard\Calendar.lua:6
ElvUI_ClassBars = defined @ElvUI_WindTools\Modules\Skins\ElvUI\ClassBars.lua:12
ElvUI_SkinDataBar = defined @ElvUI_WindTools\Modules\Skins\ElvUI\DataBars.lua:8
SkinLegendaryItemAlert = defined @ElvUI_WindTools\Modules\Skins\Blizzard\Alerts.lua:246
Blizzard_DebugTools = defined @ElvUI_WindTools\Modules\Skins\Blizzard\DebugTools.lua:7
name = "ElvUI_WindTools_Skins"
StaticPopup = defined @ElvUI_WindTools\Modules\Skins\Blizzard\StaticPopup.lua:6
Blizzard_CovenantSanctum = defined @ElvUI_WindTools\Modules\Skins\Blizzard\CovenantSanctum.lua:6
SkinFindGroupButton = defined @ElvUI_WindTools\Modules\Skins\Blizzard\ObjectiveTracker.lua