Message: Interface\AddOns\Grail\Grail.lua:3642: attempt to index field '?' (a nil value)
Time: Fri Feb 28 09:50:53 2020
Count: 1
Stack: Interface\AddOns\Grail\Grail.lua:3642: attempt to index field '?' (a nil value)
[string "@interface\AddOns\Grail\Grail.lua"]:3642: in function _LearnWorldQuest' [string "@Interface\AddOns\Grail\Grail.lua"]:3513: in function _AddWorldQuests'
[string "@interface\AddOns\Grail\Grail.lua"]:2075: in function ?' [string "@Interface\AddOns\Grail\Grail.lua"]:10580: in function _Tooltip_OnEvent'
[string "@interface\AddOns\Grail\Grail.lua"]:11166: in function <Interface\AddOns\Grail\Grail.lua:11166>

Locals: self =

{
QuestBreadcrumbsFor = defined @interface\AddOns\Grail\Grail.lua:9196
bitMaskClassPriest = 256
IsBugged = defined @interface\AddOns\Grail\Grail.lua:7067
bitMaskGenderMale = 8192
_RecordArtifactLevels = defined @interface\AddOns\Grail\Grail.lua:9794
bitMaskCompleted = 1
_PrepareWorldQuestSelfNewNPCs = defined @interface\AddOns\Grail\Grail.lua:3390
QuestLocationsAccept = defined @interface\AddOns\Grail\Grail.lua:9354
IsAvailable = defined @interface\AddOns\Grail\Grail.lua:7049
NO_SKILL = -1
_HandleEventGarrisonBuildingActivated = defined @interface\AddOns\Grail\Grail.lua:6754
bitMaskClassAll = 268443644
_HandleEventLootClosed = defined @interface\AddOns\Grail\Grail.lua:6782
bitMaskQuestLegendary = 4096
_RemoveDelayedNotification = defined @interface\AddOns\Grail\Grail.lua:5187
reputationFriends = {
}
NPC_TYPE_BY = "BY"
NPC_TYPE_DROP = "DROP"
_PostDelayedNotification = defined @interface\AddOns\Grail\Grail.lua:8463
_MarkQuestType = defined @interface\AddOns\Grail\Grail.lua:5556
receivedCalendarUpdateEventList = true
bitMaskClassDeathKnight = 4
QuestNPCPrerequisiteTurnins = defined @interface\AddOns\Grail\Grail.lua:9525
_ProcessServerBackup = defined @interface\AddOns\Grail\Grail.lua:8885
bitMaskQuestVariableLevel = 4278190080
MeetsRequirementGroup = defined @interface\AddOns\Grail\Grail.lua:8045
_EvaluateCodeAsPrerequisite = defined @interface\AddOns\Grail\Grail.lua:6071
bitMaskInLog = 16
bitMaskQuestWeekly = 4
bitMaskHolidayNoble = 256
MeetsRequirementProfession = defined @interface\AddOns\Grail\Grail.lua:8130
DoesNPCExist = defined @interface\AddOns\Grail\Grail.lua:6036
npcNames = {
}
_AllEvaluateTrueS = defined @interface\AddOns\Grail\Grail.lua:3756
bitMaskQuestFailureWithAncestor = 67043200
verifyTable = {
}
_NPCToUse = defined @interface\AddOns\Grail\Grail.lua:8316
garrisonBuildingLevelMapping = {
}
bitMaskClassHunter = 16
_LoadContinentData = defined @interface\AddOns\Grail\Grail.lua:3218
bitMaskQuestRaid = 128
_LocationStructure = defined @interface\AddOns\Grail\Grail.lua:7612
_HandleEventAchievementEarned = defined @interface\AddOns\Grail\Grail.lua:6749
checksReputationRewardsOnAcceptance = true
classToMapAreaMapping = {
}
verifyTableCount = 0
playerGenderBitMask = 8192
_ReputationExceeds = defined @interface\AddOns\Grail\Grail.lua:9982
bitMaskRaceUnused9 = 4096
zonesForLootingTreasure = {
}
bitMaskQuestMonthly = 8
mapAreaBaseClass = 200000
exists73 = true
LearnObjectName = defined @interface\AddOns\Grail\Grail.lua:7538
_ContainsAliasNPC = defined @interface\AddOns\Grail\Grail.lua:5777
classToBitMapping = {
}
FriendshipReputationNameAndLevelName = defined @interface\AddOns\Grail\Grail.lua:10081
QuestBreadcrumbs = defined @interface\AddOns\Grail\Grail.lua:9190
NPCName = defined @interface\AddOns\Grail\Grail.lua:8268
experimental = false
bitMaskRaceNightborne = 2
mapAreaBaseReputation = 400000
UnregisterObserverQuestStatus = defined @interfa

I believe that is the latest version. I have the latest version installed according to the Twitch app, anyway and I still get LUA errors like this one:

Message: Interface\AddOns\Grail\Grail.lua:3642: attempt to index field '?' (a nil value)
Time: Thu Mar 12 21:00:52 2020
Count: 1
Stack: Interface\AddOns\Grail\Grail.lua:3642: attempt to index field '?' (a nil value)
[string "=[C]"]: ?
[string "@interface\AddOns\Grail\Grail.lua"]:3642: in function _LearnWorldQuest' [string "@Interface\AddOns\Grail\Grail.lua"]:3513: in function _AddWorldQuests'
[string "@interface\AddOns\Grail\Grail.lua"]:2075: in function ?' [string "@Interface\AddOns\Grail\Grail.lua"]:10580: in function _Tooltip_OnEvent'
[string "@interface\AddOns\Grail\Grail.lua"]:11166: in function <Interface\AddOns\Grail\Grail.lua:11166>

Locals: