When I test on the WoW Retail server using the file currently uploaded to GitHub, I get the following error code

1x EditModeExpanded/FrameHandlers/TargetCast.lua:8: attempt to index global 'L' (a nil value)
[EditModeExpanded/FrameHandlers/TargetCast.lua]:8: in function 'initTargetCastBar'
[EditModeExpanded/EditModeExpanded.lua]:22: in function <EditModeExpanded/EditModeExpanded.lua:6>
[Blizzard_SharedXML/EventUtil.lua]:102: in function <Blizzard_SharedXML/EventUtil.lua:94>
[C]: ?
[Blizzard_SharedXMLBase/CallbackRegistry.lua]:144: in function <...eBlizzard_SharedXMLBase/CallbackRegistry.lua:143>
[C]: ?
[Blizzard_SharedXMLBase/CallbackRegistry.lua]:147: in function 'TriggerEvent'
[Blizzard_SharedXMLBase/GlobalCallbackRegistry.lua]:9: in function <...ns/Blizzard_SharedXMLBase/GlobalCallbackRegistry.lua:8>

Locals:
self =

{
db = {
}
}
db = {
PetActionBar = {
}
UtilityCooldownViewer = {
}
MultiBarBottomLeft = {
}
ComboPoints = {
}
MultiBarLeft = {
}
TalkingHeadFrame = {
}
SoulShards = {
}
MainStatusTrackingBarContainer = {
}
Chi = {
}
TotemFrame = {
}
DebuffFrame = {
}
ArcaneCharges = {
}
ContainerFrame1 = {
}
VehicleSeatIndicator = {
}
EMEOptions = {
}
QueueStatusButton = {
}
TargetFrame = {
}
BagsBar = {
}
AuctionHouseMultisellProgressFrame = {
}
Runes = {
}
ContainerFrameCombinedBags = {
}
CompactArenaFrame = {
}
LOC = {
}
BuffIconCooldownViewer = {
}
PartyFrame = {
}
ExtraAbilityContainer = {
}
FocusSpellBar = {
}
MinimapSeparated = {
}
FocusToT = {
}
Achievements = {
}
FocusFrame = {
}
MirrorTimerContainer = {
}
ChatFrame1 = {
}
DurabilityFrame = {
}
TargetDebuffs = {
}
MainMenuBar = {
}
HolyPower = {
}
SecondaryStatusTrackingBarContainer = {
}
BonusRoll = {
}
PlayerCastingBarFrame = {
}
TargetSpellBar = {
}
ChatFrameMenuButton = {
}
TargetBuffs = {
}
MinimapZoneName = {
}
GameTooltipDefaultContainer = {
}
StanceBar = {
}
MainMenuBarVehicleLeaveButton = {
}
MicroMenu = {
}
MultiBarRight = {
}
PetFrame = {
}
PossessActionBar = {
}
ArenaEnemyFramesContainer = {
}
CompactRaidFrameManager = {
}
ExtraActionButton = {
}
UIWidgetTopCenterContainerFrame = {
}
GameMenuFrame = {
}
MultiBar5 = {
}
EncounterBar = {
}
ChatFrameChannelButton = {
}
PlayerFrame = {
}
MicroMenuContainer = {
}
ToT = {
}
BuffBarCooldownViewer = {
}
QuickJoinToastButton = {
}
ObjectiveTrackerFrame = {
}
MultiBar7 = {
}
UIWidgetBelowMinimapContainerFrame = {
}
ArcheologyDigsiteProgressBar = {
}
MinimapCluster = {
}
CooldownManagerFrame = {
}
BuffFrame = {
}
LootFrame = {
}
EvokerEssences = {
}
CompactRaidFrameContainer = {
}
BossTargetFrameContainer = {
}
ExpansionLandingPageMinimapButton = {
}
MultiBarBottomRight = {
}
GroupLootContainer = {
}
MultiBar6 = {
}
EssentialCooldownViewer = {
}
}
(*temporary) = {
frames = {
}
framesDB = {
}
internalOnLoadFrame = {
}
firstCheckButtonPlaced = true
baseFramesDB = {
}
existingFrames = {
}
framesDialogsKeys = {
}
framesDialogs = {
}
}
(*temporary) = TargetFrameSpellBar {
showTradeSkills = false
Flash = Texture {
}
updateEvent = "PLAYER_TARGET_CHANGED"
HoldFadeOutAnim = AnimationGroup {
}
BorderShield = Texture {
}
showShield = true
unit = "target"
showCastbar = true
TextBorder = Texture {
}
StageTiers = {
}
StagePips = {
}
Background = Texture {
}
Icon = Texture {
}
StagePoints = {
}
Border = Texture {
}
Spark = Texture {
}
Text = FontString {
}
FadeOutAnim = AnimationGroup {
}
}
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to index global 'L' (a nil value)"
addon = {
db = {
}
}
lib = {
frames = {
}
framesDB = {
}
internalOnLoadFrame = {
}
firstCheckButtonPlaced = true
baseFramesDB = {
}
existingFrames = {
}
framesDialogsKeys = {
}
framesDialogs = {
}
}