Getting this errors

2x ...s\Bagnon\common\Wildpants\features\tooltipCounts.lua:179: attempt to index field 'sets' (a nil value)
...s\Bagnon\common\Wildpants\features\tooltipCounts.lua:179: in function `?'
...ommon\Wildpants\libs\WildAddon-1.0\WildAddon-1.0-1.lua:20: in function <...ommon\Wildpants\libs\WildAddon-1.0\WildAddon-1.0.lua:18>
...ommon\Wildpants\libs\WildAddon-1.0\WildAddon-1.0-1.lua:56: in function <...ommon\Wildpants\libs\WildAddon-1.0\WildAddon-1.0.lua:53>
[C]: ?
...rWeights\CallbackHandler-1.0\CallbackHandler-1.0-7.lua:29: in function <...rWeights\CallbackHandler-1.0\CallbackHandler-1.0.lua:25>
...rWeights\CallbackHandler-1.0\CallbackHandler-1.0-7.lua:64: in function `Fire'
...\common\Wildpants\libs\AceEvent-3.0\AceEvent-3.0-4.lua:120: in function <...\common\Wildpants\libs\AceEvent-3.0\AceEvent-3.0.lua:119>
[C]: in function `resume'
WeakAuras\WeakAuras-2.15.5.lua:1580: in function `Login'
WeakAuras\WeakAuras-2.15.5.lua:1661: in function <WeakAuras\WeakAuras.lua:1613>

2x ...Ons\Bagnon\common\Wildpants\features\autoDisplay.lua:70: attempt to index field 'sets' (a nil value)
...Ons\Bagnon\common\Wildpants\features\autoDisplay.lua:70: in function `RegisterDisplayEvents'
...Ons\Bagnon\common\Wildpants\features\autoDisplay.lua:28: in function `RegisterGameEvents'
...Ons\Bagnon\common\Wildpants\features\autoDisplay.lua:13: in function `?'
...ommon\Wildpants\libs\WildAddon-1.0\WildAddon-1.0-1.lua:20: in function <...ommon\Wildpants\libs\WildAddon-1.0\WildAddon-1.0.lua:18>
...ommon\Wildpants\libs\WildAddon-1.0\WildAddon-1.0-1.lua:56: in function <...ommon\Wildpants\libs\WildAddon-1.0\WildAddon-1.0.lua:53>
[C]: ?
...rWeights\CallbackHandler-1.0\CallbackHandler-1.0-7.lua:29: in function <...rWeights\CallbackHandler-1.0\CallbackHandler-1.0.lua:25>
...rWeights\CallbackHandler-1.0\CallbackHandler-1.0-7.lua:64: in function `Fire'
...\common\Wildpants\libs\AceEvent-3.0\AceEvent-3.0-4.lua:120: in function <...\common\Wildpants\libs\AceEvent-3.0\AceEvent-3.0.lua:119>

the addon "Bagnon ItemLevel" made by goldpawthenotsogreat was preventing this addon from loading for me, I'm still getting the same wildpants error though.

Same issue. mine also has BagBrother issues:
Date: 2019-12-21 14:44:15
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\BagBrother\Startup.lua line 78:
attempt to call global 'HasKey' (a nil value)
Debug:
BagBrother\Startup.lua:78: UpdateData()
BagBrother\Startup.lua:30: ?()
BagBrother\Startup.lua:20:
BagBrother\Startup.lua:20
Locals:
self = BagBrother {
BANKFRAME_OPENED = defined @interface\AddOns\BagBrother\Events.lua:42
ParseItem = defined @interface\AddOns\BagBrother\API.lua:47
SetupEvents = defined @interface\AddOns\BagBrother\Startup.lua:49
VOID_STORAGE_CLOSE = defined @interface\AddOns\BagBrother\Events.lua:68
SaveBag = defined @interface\AddOns\BagBrother\API.lua:19
PLAYER_EQUIPMENT_CHANGED = defined @interface\AddOns\BagBrother\Events.lua:31
SaveEquip = defined @interface\AddOns\BagBrother\API.lua:40
GUILDBANKFRAME_OPENED = defined @interface\AddOns\BagBrother\Events.lua:83
Realm =

AddOns:
Swatter, v8.2.6511 (SwimmingSeadragon)
ACP, v3.5.6
Altoholic, vr191
AskMrRobot, v80
AucAdvanced, v8.2.6471 (SwimmingSeadragon)
AucFilterBasic, v8.2.6497 (SwimmingSeadragon)
AucStatHistogram, v8.2.6499 (SwimmingSeadragon)
AucStatiLevel, v8.2.6503 (SwimmingSeadragon)
AucStatPurchased, v8.2.6500 (SwimmingSeadragon)
AucStatSimple, v8.2.6501 (SwimmingSeadragon)
AucStatStdDev, v8.2.6502 (SwimmingSeadragon)
AucUtilFixAH, v8.2.6504 (SwimmingSeadragon)
BagBrother, v
Bagnon, v8.2.21
Bartender4, v4.8.9
BeanCounter, v8.2.6505 (SwimmingSeadragon)
Carbonite, v@project-version@
CarboniteInfo, vv8.1.5
CarboniteNotes, vv8.1.5
CarboniteQuests, vv8.2.0
CarboniteSocial, vv8.1.5
CarboniteWarehouse, v@project-version@
CarboniteWeekly, vv8.1
DataStore, vr66
DataStoreAchievements, vr48
DataStoreAgenda, vr30
DataStoreAuctions, vr51
DataStoreCharacters, vr44
DataStoreContainers, vr60
DataStoreCrafts, vr83
DataStoreCurrencies, vr39
DataStoreGarrisons, vr25
DataStoreInventory, vr54
DataStoreMails, vr53
DataStorePets, vr45
DataStoreQuests, vr47
DataStoreReputations, vr44
DataStoreSpells, vr33
DataStoreStats, vr32
DataStoreTalents, vr62
DBMArchaeology, v
DBMCore, v8.2.31
DBMCountPackHotS, v1.7.4
DBMCountPackOverwatch, v1.4.8
DBMDefaultSkin, v
DBMStatusBarTimers, v
Details, v
DetailsEncounterDetails, v
DetailsRaidCheck, v
DetailsStreamer, v
DetailsTinyThreat, v
DetailsVanguard, v
Enchantrix, v8.2.6506 (SwimmingSeadragon)
EnchantrixBarker, v8.2.6507 (SwimmingSeadragon)
GatherMate2, v1.45.5
GTFO, v4.51
GuildGreet, v8.2.0-beta1
HandyNotes, vv1.5.9
HandyNotesArgus, v0.20.0
HandyNotesBattleForAzerothTreasures, v1
HandyNotesBrokenShore, vv1.31
HandyNotesLegionTreasures, v1
HealBot, v8.2.5.8
HealBotData, v8.2.5.0
HealBoten, v8.2.5.0
HealBotOptions, v8.2.5.0
HealBotTips, v8.2.5.8
Informant, v8.2.6508 (SwimmingSeadragon)
LibSharedMedia30, v3.0-112
MageNuggets, v6.1.1
MageNuggetsCooldownMonitor, v6.0.2
MageNuggetsStatMonitor, v6.0.2
MikScrollingBattleText, v5.7.150
OmniCC, v8.2.5
oRA3, vv8.2.5
Pawn, v2.3.12
Postal, vv3.6.0
Prat30, v3.7.45
Prat30Libraries, v
Quartz, v3.5.2
SlideBar, v8.2.6509 (SwimmingSeadragon)
Stubby, v8.2.6510 (SwimmingSeadragon)
Titan, v5.18.4.80205
TitanBag, v5.18.4.80205
TitanClock, v5.18.4.80205
TitanGold, v5.18.4.80205
TitanLocation, v5.18.4.80205
TitanLootType, v5.18.4.80205
TitanPerformance, v5.18.4.80205
TitanRepair, v5.18.4.80205
TitanVolume, v5.18.4.80205
TitanXP, v5.18.4.80205
WeakAuras, v2.15.5
WorldQuestTracker, v
BlizRuntimeLib_enUS v8.2.5.80205
(ck=a78)

Yep, something broke with the latest update. Getting lots of errors when I log in now 😞

Seems to be a BagBrother issue. Turned off all other addons (except Swatter) and got this:

Date: 2019-12-21 14:18:57
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\BagBrother\Startup.lua line 78:
attempt to call global 'HasKey' (a nil value)
Debug:
BagBrother\Startup.lua:78: UpdateData()
BagBrother\Startup.lua:30: ?()
BagBrother\Startup.lua:20:
BagBrother\Startup.lua:20
Locals:
self = BagBrother {
BANKFRAME_OPENED = defined @interface\AddOns\BagBrother\Events.lua:42
ParseItem = defined @interface\AddOns\BagBrother\API.lua:47
SetupEvents = defined @interface\AddOns\BagBrother\Startup.lua:49
VOID_STORAGE_CLOSE = defined @interface\AddOns\BagBrother\Events.lua:68
SaveBag = defined @interface\AddOns\BagBrother\API.lua:19
PLAYER_EQUIPMENT_CHANGED = defined @interface\AddOns\BagBrother\Events.lua:31
SaveEquip = defined @interface\AddOns\BagBrother\API.lua:40
GUILDBANKFRAME_OPENED = defined @interface\AddOns\BagBrother\Events.lua:83
Realm =

AddOns:
Swatter, v7.3.1 (<%codename%>)
ACP, v3.5.6
BagBrother, v
BlizRuntimeLib_enUS v8.2.5.80205
(ck=6a)