Logged onto wow, after installing latest version. Messaged someone to get invite to group. They answered back. Closed window and got the following error:

Date: 2009-09-05 23:51:04
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\WIM\Sources\WindowHandler.lua line 543:
   attempt to perform arithmetic on a nil value
Debug:
   [C]: ?
   WIM\Sources\WindowHandler.lua:543
      WIM\Sources\WindowHandler.lua:523
AddOns:
  Swatter, v5.6.4424 (KangaII)
  NPCScan, v3.2.0.5
  AdvancedTradeSkillWindow, v
  AggroNotifier, v1.2.5
  Altoholic, v3.2.001d
  AucAdvanced, v5.6.4424 (KangaII)
  AucDb, v5.1.DEV.3583
  AucFilterBasic, v5.6.4424 (KangaII)
  AucFilterOutlier, v5.6.4424.2531
  AucMatchUndercut, v5.6.4424.2531
  AucStatClassic, v5.6.4424 (KangaII)
  AucStatHistogram, v5.6.4424 (KangaII)
  AucStatiLevel, v5.6.4424 (KangaII)
  AucStatPurchased, v5.6.4424 (KangaII)
  AucStatSales, v5.6.4424.2842
  AucStatSimple, v5.6.4424 (KangaII)
  AucStatStdDev, v5.6.4424 (KangaII)
  AucStatWOWEcon, v5.6.4424.2530
  AucUtilAHWindowControl, v5.6.4424.3311
  AucUtilAppraiser, v5.6.4424.2530
  AucUtilAskPrice, v5.6.4424.3175
  AucUtilAutoMagic, v5.6.4424.3142
  AucUtilCompactUI, v5.6.4424.2530
  AucUtilEasyBuyout, v5.6.4424.3583
  AucUtilFixAH, v5.6.4424 (KangaII)
  AucUtilItemSuggest, v5.6.4424.3108
  AucUtilPriceLevel, v5.6.4424.2545
  AucUtilScanButton, v5.6.4424.2530
  AucUtilScanFinish, v5.6.4424.2530
  AucUtilScanProgress, v5.6.4424.2530
  AucUtilSearchUI, v5.6.4424.3655
  AucUtilSimpleAuction, v5.6.4424.0
  AucUtilVendMarkup, v5.6.4424.2530
  AuctionLite, v1.3
  autograts, v
  Babylonian, v5.1.DEV.130
  BeanCounter, v5.6.4424 (KangaII)
  Carbonite, v3.22
  CarboniteTransfer, v1.01
  ClassLoot, vv1.6.5
  Configator, v5.1.DEV.130
  coolrepair, v1.0
  DamnQuestIcons, v
  DataStore, v3.2.001
  DataStoreAchievements, v3.2.001
  DataStoreAuctions, v3.2.001
  DataStoreCharacters, v3.2.001
  DataStoreContainers, v3.2.001
  DataStoreCrafts, v3.2.001
  DataStoreCurrencies, v3.2.001
  DataStoreInventory, v3.2.001
  DataStoreMails, v3.2.001
  DataStorePets, v3.2.001
  DataStoreQuests, v3.2.001
  DataStoreReputations, v3.2.001
  DataStoreSkills, v3.2.001
  DataStoreSpells, v3.2.001
  DataStoreStats, v3.2.001
  DataStoreTalents, v3.2.001
  DBMBurningCrusade, v
  DBMCore, v
  DBMLDB, v
  DBMSpellTimers, v
  DBMVictorySound, v
  DebugLib, v5.1.DEV.130
  EavesDrop, v2.1
  Enchantrix, v5.6.4424 (KangaII)
  EnchantrixBarker, v5.6.4424 (KangaII)
  FriendsShare, v
  FuBar, v
  FuBarCraftTimersFu, v
  FuBarDualSpecFu, v2.0.0
  FuBarDurabilityFu, v2.11
  FuBarExitFu, v1.1
  FuBarExpFu, v2.1.2
  FuBarFactionsFu, v2.2.1-79
  FuBarGearRating, v1.0
  FuBarNetWorthFu, v
  FuBarOutfitterFu, v
  FuBarProfessionsFu, v3.0.4
  GroupCalendar, v4.5.1
  Informant, v5.6.4424 (KangaII)
  LibRock10, v
  LilSparkysWorkshop, v1.00
  MageAnnounce, v1.2
  MikScrollingBattleText, v5.4.64
  nUI, v5.05.02 (Plus)
  nUIAuraButtons, v5.02.00
  nUIConfigGUI, v30100.7
  nUIInfoPanelCarbonite, v
  nUIInfoPanelMagePorts, v1.02.03
  nUIInfoPanelProfesions, v1.02.01
  nUISpiel, v1.00.00
  Outfitter, v4.7.4
  Overachiever, v0.46
  OverachieverTabs, v0.46
  OverachieverTrade, v0.46
  Postal, v3.2.0
  ReagentHelper2, vv2.0.8
  RepWatcher, v
  SellJunk, v2.5
  SheepWatch, v30016
  Skada, v1.2-21
  SkadaAbsorbs, v1.0
  SkadaCC, v1.0
  SkadaDamage, v1.0
  SkadaDamageTaken, v1.0
  SkadaDeaths, v1.0
  SkadaDebuffs, v1.0
  SkadaDispels, v1.0
  SkadaEnemies, v1.0
  SkadaFailbot, v1.0
  SkadaHealing, v1.0
  SkadaPower, v1.0
  SkadaThreat, v1.0
  SlideBar, v5.6.4424 (KangaII)
  SmartRes, v6.03
  Stubby, v5.6.4424 (KangaII)
  TBAntiDaze, vr38-release
  TrinketMenu, v
  UrbinRange, v30200.1
  viperwatch, v1.0.1
  VuhDo, v1.188
  WIM, v3.1.3
  BlizRuntimeLib_enUS v3.2.0.30200 <us>
  (ck=d0f)