QuestHelper Error

[Erurainon]

On XP Pro w/SP2, using WowMatrix to update addons daily before entering game. Per WM, I have QH ver 0.43 and all addons are up-to-date. Everytime I enter the game however, I get the following error:

Date: 2008-04-20 12:11:24
ID: 57
Error occured in: Global
Count: 1
Message: ..\AddOns\QuestHelper\dodads.lua line 692:
AceOO-2.0: Cannot instantiate a virtual class.
Debug:
[C]: ?
[C]: error()
Ace2\AceLibrary\AceLibrary.lua:122: error()
Ace2\AceOO-2.0\AceOO-2.0.lua:438: new()
QuestHelper\dodads.lua:692:
QuestHelper\dodads.lua:603
AddOns:
AtlasLoot, vAtlasLoot Enhanced v4.04.01
Bartender3, v3.1.2 r68497
BaudBag, v1.3
CartographerCleanup, v1.0
CartographerData, v1.0
CartographerMailboxes, v1.0
CartographerMining, v1.0
CartographerTrainers, v1.0
CartographerVendors, v1.0
Cartographer1, v2.0
CartographerQuestInfo, v1.9.20
Cartographer, vr68213
CartographerFishing, v1.0
CartographernnTrainers, v1
CartographerQuestObjectives, v0.9b
CartographerQuests, v0.2
CartographerRoutes, v1.0
CartographerTreasure, v1.0
ClearFont2, v2.4
clsaver, v1.7
CooldownTimers2, v2.5
cyCircled, v0.5
DoubleWide
Enchantrix, v5.0.PRE.3024
EnchantrixBarker, v5.0.PRE.3024 (BillyGoat)
EnhTooltip, v5.0.PRE.3024
FuBarClockFu, v3.0
FuBarDebugFu, v1.1 $Revision: 40913 $
FuBarDurabilityFu, v2.0
FuBarFactionsFu, v2.2
FuBarFriendsFu, v2.4
FuBarGuildFu, v2.4
FuBarMailFu, v2.0
FuBarMoneyFu, v20000-1
FuBarNetStatsFu, v2.0
FuBarPerformanceFu, v2.0
FuBarRoutesFu
FuBarswitcherFu, v20003-1
FuBarTrackerFu, v2.3 ($Revision: 69421 $)
FuBarWaypointsFu, v1.0
FuBar2
FuBar, v52783
Informant, v5.0.PRE.3024
Ace2
Ace3
LightHeaded, v230
PerlArcaneBar
PerlCombatDisplay
PerlConfig
PerlFocus
PerlParty
PerlPartyPet
PerlPartyTarget
PerlPlayer
PerlPlayerPet
PerlTarget
PerlTargetTarget
Prat, v2.0 68549
QuestHelper, v0.43
RatingBuster, v1.3.7 (r70016)
Routes, v1.0
sct, v6.1
Squeenix
Stubby, v52
Swatter, v5.0.PRE.3024

What does 'Cannot instantiate a virtual class' mean? What do I need to do to fix this error? In the past this error apparently messed with Auctioneer scans, but now I have QH disabled on my main as it's more of a nuisance for him. It's really helpful at low levels thoguh and I'd like to get it running well.

[Erurainon]

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