I was taking the taxi from Dalaran when this error popped up:

Date: 2011-02-19 13:10:14
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\EveryQuest\events.lua line 63:
   bad argument #3 to 'format' (number expected, got nil)
Debug:
   (tail call): ?
   [C]: ?
   EveryQuest\events.lua:63 ?()
   ...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:147
      ...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:147
   [string "safecall Dispatcher[1]"]:4:
      [string "safecall Dispatcher[1]"]:4
   [C]: ?
   [string "safecall Dispatcher[1]"]:13: ?()
   ...Ons\Ace3\CallbackHandler-1.0\CallbackHandler-1.0.lua:92 Fire()
   Ace3\AceEvent-3.0\AceEvent-3.0.lua:120
      Ace3\AceEvent-3.0\AceEvent-3.0.lua:119
AddOns:
  Swatter, v3.2.3 (<%codename%>)
  NPCScan, v4.0.3.6
  Ace3, v
  AckisRecipeList, v2.2.2-14-gfac6a9a
  ACP, vr140
  Altoholic, v4.0.005c
  Atlas, v1.18.2
  AtlasBattlegrounds, v1.18.2
  AtlasDungeonLocs, v1.18.2
  AtlasOutdoorRaids, v1.18.2
  AtlasTransportation, v1.18.2
  AtlasQuest, v4.6.1
  AucAdvanced, v5.9.4960 (WhackyWallaby)
  AucFilterBasic, v5.9.4960 (WhackyWallaby)
  AucFilterOutlier, v5.9.4960.2531
  AucMatchUndercut, v5.9.4960.2531
  AucScanData, v5.9.4960 (WhackyWallaby)
  AucStatHistogram, v5.9.4960 (WhackyWallaby)
  AucStatiLevel, v5.9.4960 (WhackyWallaby)
  AucStatPurchased, v5.9.4960 (WhackyWallaby)
  AucStatSales, v5.9.4960.2842
  AucStatSimple, v5.9.4960 (WhackyWallaby)
  AucStatStdDev, v5.9.4960 (WhackyWallaby)
  AucStatWOWEcon, v5.9.4960.2530
  AucUtilAHWindowControl, v5.9.4960.3311
  AucUtilAppraiser, v5.9.4960.2530
  AucUtilAskPrice, v5.9.4960.3175
  AucUtilAutoMagic, v5.9.4960.3142
  AucUtilCompactUI, v5.9.4960.2530
  AucUtilEasyBuyout, v5.9.4960.3583
  AucUtilFixAH, v5.9.4960 (WhackyWallaby)
  AucUtilGlypher, v5.9.4960.2545
  AucUtilItemSuggest, v5.9.4960.3108
  AucUtilPriceLevel, v5.9.4960.2545
  AucUtilScanButton, v5.9.4960.2530
  AucUtilScanFinish, v5.9.4960.2530
  AucUtilScanProgress, v5.9.4960.2530
  AucUtilScanStart, v5.9.4960.4819
  AucUtilSearchUI, v5.9.4960.3655
  AucUtilSimpleAuction, v5.9.4960.4546
  AucUtilVendMarkup, v5.9.4960.2530
  AutoDing, v4.1
  Automaton, v1.3.10
  Babylonian, v5.1.DEV.130
  BadBoy, v6.441
  BadBoyCCleaner, v3.25
  BadBoyGuilded, v1.28
  BadBoyLevels, v2.76
  BeanCounter, v5.9.4960 (WhackyWallaby)
  BeQuiet, v1.1.0
  BrokerSkills, v1.0
  BuyEmAll, v3.0.4
  Configator, v5.1.DEV.282
  CurseProfiler, v
  DataStore, v4.0.001
  DataStoreAchievements, v4.0.001
  DataStoreAuctions, v4.0.001
  DataStoreCharacters, v4.0.001
  DataStoreContainers, v4.0.001
  DataStoreCrafts, v4.0.001
  DataStoreCurrencies, v4.0.001
  DataStoreInventory, v4.0.005b
  DataStoreMails, v4.0.001
  DataStorePets, v4.0.001
  DataStoreQuests, v4.0.001
  DataStoreReputations, v4.0.001
  DataStoreSpells, v4.0.001
  DataStoreStats, v4.0.001
  DataStoreTalents, v4.0.001
  DebugLib, v5.1.DEV.275
  Enchantrix, v5.9.4960 (WhackyWallaby)
  EnchantrixBarker, v5.9.4960 (WhackyWallaby)
  EveryQuest, v2.4.r217-release
  EveryQuestNorthrend, vr217-release
  FishingBuddy, v0.9.9e4
  FlightMap, v4.0.3-beta
  Gatherer, v3.2.3
  GatherMate2, v1.12
  GreedyQuester, v4.0.3
  Informant, v5.9.4960 (WhackyWallaby)
  KarniCrap, v3.2.1
  LearningAid, v1.11 Beta 2
  LightHeaded, v330
  LightHeadedDataD, v330
  LightHeadedDataQIDNames, v330
  Livestock, v1.3.5
  MoveAnything, v11.4.5
  Odyssey, v4.0.002
  Omen, v3.1.0
  Outfitter, v5.2
  Postal, v3.4.4
  Quartz, v3.0.5
  Rawr, v0.64
  Recount, v
  StatScore, v4.0.3.27
  Stubby, v5.9.4960 (WhackyWallaby)
  Titan, v5.0.2.40000 - Revision 519
  TitanBag, v5.0.2.40000
  TitanGold, v5.0.2.40000
  TitanRepair, v5.0.2.40000
  TitanVolume, v5.0.2.40000
  TomTom, vv40000-1.2.1-beta
  TradeskillInfo, v2.1.2
  BlizRuntimeLib_enUS v4.0.6.40000 <us>
  (ck=be2)