What steps will reproduce the problem?

I get this error right when i login on any of my toons. The addon seems to work with out issue but keep getting this error.

What version of ThreatClassic2 are you using? (Stating 'latest' is not useful)

v2.55-cata

Do you have an error log of what happened?

18x ThreatClassic2/core/core.lua:280: attempt to call field 'GetSpellInfo' (a nil value)
[string "@ThreatClassic2/core/core.lua"]:280: in function UpdateThreatBars' [string "@ThreatClassic2/core/core.lua"]:786: in function UpdateBars'
[string "@ThreatClassic2/core/core.lua"]:686: in function UpdateFrame' [string "@ThreatClassic2/core/core.lua"]:995: in function SetupFrame'
[string "@ThreatClassic2/core/core.lua"]:916: in function `?'
[string "@ThreatClassic2/core/core.lua"]:842: in function <ThreatClassic2/core/core.lua:841>

Locals:
self =

{
colorFallback = {
}
FlashScreen = defined @ThreatClassic2/core/core.lua:493
PLAYER_ENTERING_WORLD = defined @ThreatClassic2/core/core.lua:854
MenuGenerator = defined @ThreatClassic2/core/core.lua:998
CheckWarning = defined @ThreatClassic2/core/core.lua:456
UnregisterComm = defined @Ace3/CallbackHandler-1.0/CallbackHandler-1.0.lua:143
RefreshProfile = defined @ThreatClassic2/core/core.lua:1038
partyUnits = {
}
UpdateThreatBars = defined @ThreatClassic2/core/core.lua:271
PLAYER_REGEN_DISABLED = defined @ThreatClassic2/core/core.lua:883
OnCommReceived = defined @ThreatClassic2/core/core.lua:812
version = "2.55"
UpdateBars = defined @ThreatClassic2/core/core.lua:689
playerClass = ""
PublishVersion = defined @ThreatClassic2/core/core.lua:829
SetupConfig = defined @ThreatClassic2/core/core.lua:1025
partyPetUnits = {
}
db = {
}
PLAYER_LOGIN = defined @ThreatClassic2/core/core.lua:903
configTable = {
}
raidUnits = {
}
SetupFrame = defined @ThreatClassic2/core/core.lua:965
locale = "enUS"
UNIT_TARGET = defined @ThreatClassic2/core/core.lua:862
GROUP_ROSTER_UPDATE = defined @ThreatClassic2/core/core.lua:873
SendCommMessage = defined @Ace3/AceComm-3.0/AceComm-3.0.lua:83
defaultConfig = {
}
PLAYER_REGEN_ENABLED = defined @ThreatClassic2/core/core.lua:890
PLAYER_TARGET_CHANGED = defined @ThreatClassic2/core/core.lua:862
UnregisterAllComm = defined @Ace3/CallbackHandler-1.0/CallbackHandler-1.0.lua:164
playerTarget = ""
threatData = {
}
UNIT_THREAT_LIST_UPDATE = defined @ThreatClassic2/core/core.lua:896
ZONE_CHANGED_NEW_AREA = defined @ThreatClassic2/core/core.lua:879
playerName = ""
SetupUnits = defined @ThreatClassic2/core/core.lua:950
RegisterComm = defined @Ace3/AceComm-3.0/AceComm-3.0.lua:56
TestMode = defined @ThreatClassic2/core/core.lua:792
frame = ThreatClassic2BarFrame {
}
addonName = "ThreatClassic2"
raidPetUnits = {
}
commPrefix = "TC2"
UpdateFrame = defined @ThreatClassic2/core/core.lua:621
bars = {
}
numGroupMembers = 0
SetBarCount = defined @ThreatClassic2/core/core.lua:617
}
playerIncluded = false
igniteOwner = nil
hasActiveIgnite = false
(*temporary) = defined =[C]:-1
(*temporary) = 7
(*temporary) = defined @Blizzard_FrameXMLUtil/Classic/AuraUtil.lua:57
(*temporary) = nil
(*temporary) = 12848
(*temporary) = "attempt to call field 'GetSpellInfo' (a nil value)"
sort = defined =[C]:-1
Compare = defined @ThreatClassic2/core/core.lua:177
C = {
general = {
}
backdrop = {
}
font = {
}
filter = {
}
warnings = {
}
igniteIndicator = {
}
frame = {
}
customBarColors = {
}
bar = {
}
}
select = defined =[C]:-1
FindAuraByName = defined @Blizzard_FrameXMLUtil/Classic/AuraUtil.lua:57
TC2 = {
colorFallback = {
}
FlashScreen = defined @ThreatClassic2/core/core.lua:493
PLAYER_ENTERING_WORLD = defined @ThreatClassic2/core/core.lua:854
MenuGenerator = defined @ThreatClassic2/core/core.lua:998
CheckWarning = defined @Inter

Any additional information? (example: WoW language if not English) (Attach screenshots here if available, do not link externally)