RETAIL ERROR

4x Interface/AddOns/ZPerl_ArcaneBar/ZPerl_ArcaneBar.lua:258: attempt to perform arithmetic on global 'CASTING_BAR_HOLD_TIME' (a nil value)
[string "@Interface/AddOns/ZPerl_ArcaneBar/ZPerl_ArcaneBar.lua"]:258: in function <Interface/AddOns/ZPerl_ArcaneBar/ZPerl_ArcaneBar.lua:152>

Locals:
self = XPerl_TargetnameFrameCastBar {
0 =
fadeOut = 1
castTimeText = XPerl_TargetnameFrameCastBarcastTimeText {
}
holdTime = 0
unit = "target"
barParentName = XPerl_TargetnameFrametext {
}
spellText = XPerl_TargetnameFrameCastBarspellText {
}
castID = "Cast-3-3112-2222-24128-339122-00D0EFE49D"
startTime = 271339.164000
barSpark = XPerl_TargetnameFrameCastBarbarSpark {
}
flash = 1
maxValue = 271341.164000
sign = "+"
Enabled = 1
delaySum = 0
tex = XPerl_TargetnameFrameCastBartex {
}
showTradeSkills = true
barFlash = XPerl_TargetnameFrameCastBarbarFlash {
}
}
event = "UNIT_SPELLCAST_INTERRUPTED"
unit = "target"
lineGUID = "Cast-3-3112-2222-24128-339122-00D0EFE49D"
spellID = 339122
(*temporary) = 271340.754000
(*temporary) = nil
(*temporary) =
(*temporary) = 1
(*temporary) = 0
(*temporary) = 0
(*temporary) = 1
(*temporary) =
(*temporary) = false
(*temporary) = "Cast-3-3112-2222-24128-339122-00D0EFE49D"
(*temporary) = true
(*temporary) = 271341254
(*temporary) = true
(*temporary) = 339122
(*temporary) = "attempt to perform arithmetic on global 'CASTING_BAR_HOLD_TIME' (a nil value)"
UnitChannelInfo = defined =[C]:-1
UnitCastingInfo = defined =[C]:-1
conf =

{
highlight = {
}
optionsColour = {
}
highlightSelection = 1
targettargettarget = {
}
rangeFinder = {
}
showAFK = 1
combatFlash = 1
buffHelper = {
}
raidpet = {
}
target = {
}
raid = {
}
minimap = {
}
colour = {
}
focus = {
}
xperlOldroleicons = 1
pet = {
}
highlightDebuffs = {
}
transparency = {
}
tooltip = {
}
targettarget = {
}
partypet = {
}
pettarget = {
}
player = {
}
custom = {
}
focustarget = {
}
party = {
}
buffs = {
}
maximumScale = 1.500000
bar = {
}
}
barColours = {
failure = {
}
success = {
}
main = {
}
channel = {
}
}
IsClassic = false
shield_icon = "|TGroupFrame\UI-Group-MainTankIcon:0:0:0:0|t"
ActiveCasting = defined @Interface/AddOns/ZPerl_ArcaneBar/ZPerl_ArcaneBar.lua:134