When I start the game I receive the following error.  Seems likely a conflict with another addon?

Date: 2009-05-25 09:54:59
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\QuestHelper\arrow.lua line 190:
   attempt to index global 'QuestHelper' (a nil value)
Debug:
   (tail call): ?
   [C]: ?
   QuestHelper\arrow.lua:190
      QuestHelper\arrow.lua:189
   QuestHelper\arrow.lua:104
      QuestHelper\arrow.lua:101
AddOns:
  Swatter, v3.1.13 (<%codename%>)
  Atlas, v1.14.1
  AtlasBattlegrounds, v1.14.1
  AtlasDungeonLocs, v1.14.1
  AtlasOutdoorRaids, v1.14.1
  AtlasTransportation, v1.14.1
  AucAdvanced, v5.4.4157 (WallabyII)
  AucFilterBasic, v5.4.4157 (WallabyII)
  AucFilterOutlier, v5.4.4157.2531
  AucMatchUndercut, v5.4.4157.2531
  AucStatClassic, v5.4.4157 (WallabyII)
  AucStatHistogram, v5.4.4157 (WallabyII)
  AucStatiLevel, v5.4.4157 (WallabyII)
  AucStatPurchased, v5.4.4157 (WallabyII)
  AucStatSales, v5.4.4157.2842
  AucStatSimple, v5.4.4157 (WallabyII)
  AucStatStdDev, v5.4.4157 (WallabyII)
  AucStatWOWEcon, v5.4.4157.2530
  AucUtilAHWindowControl, v5.4.4157.3311
  AucUtilAppraiser, v5.4.4157.2530
  AucUtilAskPrice, v5.4.4157.3175
  AucUtilAutoMagic, v5.4.4157.3142
  AucUtilCompactUI, v5.4.4157.2530
  AucUtilEasyBuyout, v5.4.4157.3583
  AucUtilItemSuggest, v5.4.4157.3108
  AucUtilPriceLevel, v5.4.4157.2545
  AucUtilScanButton, v5.4.4157.2530
  AucUtilScanFinish, v5.4.4157.2530
  AucUtilScanProgress, v5.4.4157.2530
  AucUtilSearchUI, v5.4.4157.3655
  AucUtilSimpleAuction, v5.4.4157.0
  AucUtilVendMarkup, v5.4.4157.2530
  Babylonian, v5.1.DEV.130
  BeanCounter, v5.4.4157 (WallabyII)
  BonusScanner, v4.9
  BrokerBonusScanner, v1.1
  Carbonite, v3.11
  CarboniteTransfer, v1.01
  Cartographer, v2.0
  CartographerBattlegrounds, v2.0
  CartographerCoordinates, v2.0
  CartographerFoglight, v2.0
  CartographerGroupColors, v2.0
  CartographerGuildPositions, v2.0
  CartographerInstanceLoot, v2.0
  CartographerInstanceMaps, v2.0
  CartographerInstanceNotes, v2.0
  CartographerLookNFeel, v2.0
  CartographerNotes, v2.0
  CartographerPOI, v2.0
  CartographerWaypoints, v2.0
  CartographerZoneInfo, v2.0
  Configator, v5.1.DEV.130
  CurseProfiler, v
  DebugLib, v5.1.DEV.130
  Decursive, v2.4.0.3
  Enchantrix, v5.4.4157 (WallabyII)
  EnchantrixBarker, v5.4.4157 (WallabyII)
  EquipCompare, v2.16
  Gatherer, v3.1.13
  HealBot, v3.1.0.2
  Informant, v5.4.4157 (WallabyII)
  LightHeaded, v288
  Mendeleev, v3.0
  PallyPower, vv3.1.15-release
  QuestGuru, v1.0.8
  QuestGuruHistory, v1.0.5
  QuestGuruTracker, v1.2.1
  QuestHelper, v1.0.18-beta
  SHIT, v1.15
  SlideBar, v3.1.13 (<%codename%>)
  Stubby, v5.4.4157 (WallabyII)
  Talented, v2.2
  talentedspectabs, v
  Titan, v4.2.2.30100 - Revision 239
  TitanAmmo, v4.2.2.30100
  TitanBag, v4.2.2.30100
  TitanClock, v4.2.2.30100
  TitanCoords, v4.2.2.30100
  TitanGoldTracker, v4.2.2.30100
  TitanHealBot, v3.1.0.0
  TitanLootType, v4.2.2.30100
  TitanPerformance, v4.2.2.30100
  TitanRegen, v4.2.2.30100
  TitanRepair, v4.2.2.30100
  TitanVolume, v4.2.2.30100
  TitanXP, v4.2.2.30100
  (ck=a83)