Started getting this when I dual box and after forming my grp.
Edit 1: I reinstalled Quest but still got the errors. Replace the libs in Maps and the error went away. Could have been a corruption a one of this files. If you cannot replicate just close this.
Edit 2: Still getting error when first joining group.

Message: Interface\AddOns\Carbonite.Quests\NxQuest.lua:9697: attempt to concatenate local 'color' (a nil value)
Time: Tue Apr 16 13:56:45 2019
Count: 10
Stack: Interface\AddOns\Carbonite.Quests\NxQuest.lua:9697: attempt to concatenate local 'color' (a nil value)
Interface\AddOns\Carbonite.Quests\NxQuest.lua:9697: in function UpdateList' Interface\AddOns\Carbonite.Quests\NxQuest.lua:9067: in function func'
...\AddOns\DataStore\libs\AceTimer-3.0\AceTimer-3.0.lua:57: in function <...\AddOns\DataStore\libs\AceTimer-3.0\AceTimer-3.0.lua:50>

Locals: self =

{
UpdateList = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9076
Win = {
}
Menu_OnRemoveWatch = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8857
WinUpdateFade = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9816
ClearAutoTarget = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8965
ShowUpdate = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9799
ClosestCur = {
}
ClearCompleted = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:10052
OnUpdateTimer = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8985
Open = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8581
AddCustom = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9034
ButATarget = {
}
ButSwap = {
}
Menu = {
}
Add = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:10031
Watched = {
}
Menu_OnRemoveAllWatches = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8904
Menu_OnAbandon = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8899
Update = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9019
CalcDistCnt = 25
CalcDistI = 1
FlashColor = 0
Menu_OnShowMap = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8873
Opened = true
RemoveWatch = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8918
ClearCustom = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9030
RMenu = {
}
WatchMenu = {
}
Menu_OnShare = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8883
List = {
}
MenuPri = {
}
Set = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9949
ButShowParty = {
}
ButQGivers = {
}
ButShowOnMap = {
}
OnTimer = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9047
OnListEvent = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9834
Menu_OnShowQuest = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8864
SetSortMode = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8981
ButMenu = {
}
Menu_OnLinkQuest = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8878
OnWin = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8851
FixedChange = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8844
ButPri = {
}
}
Nx = {
GetDataToolBar = defined @interface\AddOns\Carbonite\Carbonite.lua:1868
modules = {
}
CancelTimer = defined @interface\AddOns\DataStore\libs\AceTimer-3.0\AceTimer-3.0.lua:147
Quest = {
}
OnUnit_spellcast_sent = defined @interface\AddOns\Carbonite\Carbonite.lua:1098
IsGathering = defined @interface\AddOns\Carbonite\Carbonite.lua:3001
prt = defined @interface\AddOns\Carbonite\NxUI.lua:133
BarData = {
}
prtVar = defined @interface\AddOns\Carbonite\NxUI.lua:204
ScheduleTimer = defined @interface\AddOns\DataStore\libs\AceTimer-3.0\AceTimer-3.0.lua:94
GroupMembers = {
}
ADDON_LOADED = defined @interface\AddOns\Carbonite\Carbonite.lua:837
VERSIONINFO = 0.240000
prtFrame = d

After disabling Altoholic and Datastore I am getting this error..

Message: Interface\AddOns\Carbonite.Quests\NxQuest.lua:9697: attempt to concatenate local 'color' (a nil value)
Time: Tue Apr 16 14:48:20 2019
Count: 267
Stack: Interface\AddOns\Carbonite.Quests\NxQuest.lua:9697: attempt to concatenate local 'color' (a nil value)
Interface\AddOns\Carbonite.Quests\NxQuest.lua:9697: in function UpdateList' Interface\AddOns\Carbonite.Quests\NxQuest.lua:9067: in function func'
...er_DurabilityInfo\Libs\AceTimer-3.0\AceTimer-3.0.lua:57: in function <...er_DurabilityInfo\Libs\AceTimer-3.0\AceTimer-3.0.lua:50>

Locals: self =

{
UpdateList = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9076
Win = {
}
Menu_OnRemoveWatch = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8857
WinUpdateFade = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9816
ClearAutoTarget = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8965
ShowUpdate = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9799
ClosestCur = {
}
ClearCompleted = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:10052
OnUpdateTimer = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8985
Open = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8581
AddCustom = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9034
ButATarget = {
}
ButSwap = {
}
Menu = {
}
Add = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:10031
Watched = {
}
Menu_OnRemoveAllWatches = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8904
Menu_OnAbandon = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8899
Update = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9019
CalcDistCnt = 25
CalcDistI = 1
FlashColor = 0
Menu_OnShowMap = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8873
Opened = true
RemoveWatch = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8918
ClearCustom = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9030
RMenu = {
}
WatchMenu = {
}
Menu_OnShare = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8883
List = {
}
MenuPri = {
}
Set = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9949
ButShowParty = {
}
ButQGivers = {
}
ButShowOnMap = {
}
OnTimer = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9047
OnListEvent = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:9834
Menu_OnShowQuest = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8864
SetSortMode = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8981
ButMenu = {
}
Menu_OnLinkQuest = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8878
OnWin = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8851
FixedChange = defined @interface\AddOns\Carbonite.Quests\NxQuest.lua:8844
ButPri = {
}
}
Nx = {
GetDataToolBar = defined @interface\AddOns\Carbonite\Carbonite.lua:1868
modules = {
}
CancelTimer = defined @interface\AddOns\Broker_DurabilityInfo\Libs\AceTimer-3.0\AceTimer-3.0.lua:147
Quest = {
}
OnUnit_spellcast_sent = defined @interface\AddOns\Carbonite\Carbonite.lua:1098
IsGathering = defined @interface\AddOns\Carbonite\Carbonite.lua:3001
prt = defined @interface\AddOns\Carbonite\NxUI.lua:133
BarData = {
}
prtVar = defined @interface\AddOns\Carbonite\NxUI.lua:204
ScheduleTimer = defined @interface\AddOns\Broker_DurabilityInfo\Libs\AceTimer-3.0\AceTimer-3.0.lua:94
GroupMembers = {
}
ADDON_LOADED = defined @interface\AddOns\Carbonite\Carbonite.lua:837
VERSIONINFO = 0.240000