WowAce

What steps will reproduce the problem?
1. Entering the game.

Do you have an error log of what happened?
{
            ["message"] = "...AddOns\\GnomishYellowPages\\libs\\LibTradeSkillScan.lua:220: attempt to call upvalue 'CloseTradeSkill' (a nil value)",
            ["count"] = 1,
            ["addons"] = "  BlizzBugsSuck, v4.0.3.2\n  Swatter, v5.12.5198 (QuirkyKiwi)\n  AckisRecipeList, v2.2.7-15-g1293860\n  ACP, vr148 \n  Altoholic, v4.2.001\n  Alts, v0.5\n  Archy, v1.8.5a\n  AucAdvanced, v5.12.5198 (QuirkyKiwi)\n  AucFilterBasic, v5.12.5198 (QuirkyKiwi)\n  AucFilterOutlier, v5.12.5198.5194(5.12/embedded)\n  AucMatchUndercut, v5.12.5198.4828(5.12/embedded)\n  AucStatHistogram, v5.12.5198 (QuirkyKiwi)\n  AucStatiLevel, v5.12.5198 (QuirkyKiwi)\n  AucStatPurchased, v5.12.5198 (QuirkyKiwi)\n  AucStatSales, v5.12.5198.4838(5.12/embedded)\n  AucStatSimple, v5.12.5198 (QuirkyKiwi)\n  AucStatStdDev, v5.12.5198 (QuirkyKiwi)\n  AucStatWOWEcon, v5.12.5198.4828(5.12/embedded)\n  AucUtilAHWindowControl, v5.12.5198.5133(5.12/embedded)\n  AucUtilAppraiser, v5.12.5198.5194(5.12/embedded)\n  AucUtilAskPrice, v5.12.5198.5162(5.12/embedded)\n  AucUtilAutoMagic, v5.12.5198.5184(5.12/embedded)\n  AucUtilCompactUI, v5.12.5198.5016(5.12/embedded)\n  AucUtilEasyBuyout, v5.12.5198.4897(5.12/embedded)\n  AucUtilFixAH, v5.12.5198 (QuirkyKiwi)\n  AucUtilItemSuggest, v5.12.5198.5144(5.12/embedded)\n  AucUtilJeweler, vB2.0.8\n  AucUtilJewelerPost, vB0.9.2\n  AucUtilPriceLevel, v5.12.5198.4861(5.12/embedded)\n  AucUtilScanButton, v5.12.5198.5159(5.12/embedded)\n  AucUtilScanFinish, v5.12.5198.5159(5.12/embedded)\n  AucUtilScanProgress, v5.12.5198.4979(5.12/embedded)\n  AucUtilScanStart, v5.12.5198.5159(5.12/embedded)\n  AucUtilSearchUI, v5.12.5198.5184(5.12/embedded)\n  AucUtilSimpleAuction, v5.12.5198.4993(5.12/embedded)\n  AucUtilVendMarkup, v5.12.5198.4828(5.12/embedded)\n  Auditor2, v4.4.2\n  Babylonian, v5.1.DEV.312(/embedded)\n  BankStack, vr190\n  BeanCounter, v5.12.5198 (QuirkyKiwi)\n  BetterPowerBarAlt, vr19\n  BloodShieldTracker, v0.11\n  BossNotes, v1.2.6\n  BossNotesAbilities, v\n  BossNotesEmotes, v\n  BossNotesPersonalNotes, v\n  BossNotesRules, v\n  BossNotesTactics, v\n  BrokerAuditor, v4.4.2\n  BrokerDurabilityInfo, v1.9\n  BrokerGroup, v\n  BrokerRecount, v1.0\n  BrokerSysMon, vr70\n  Cellular, v4.2.001\n  ClassIcons, v3.0\n  ClassLoot, vv1.7.3\n  Clique, vv40200-1.4.0-8-g03de6e4\n  CloseUp, v4.2.001\n  Configator, v5.1.DEV.312(/embedded)\n  DailyGrind, v1.3.14\n  DataStore, v4.2.001\n  DataStoreAchievements, v4.2.001\n  DataStoreAgenda, v4.2.001\n  DataStoreAuctions, v4.2.001\n  DataStoreCharacters, v4.2.001\n  DataStoreContainers, v4.2.001\n  DataStoreCrafts, v4.2.001\n  DataStoreCurrencies, v4.2.001\n  DataStoreInventory, v4.2.001\n  DataStoreMails, v4.2.001\n  DataStorePets, v4.2.001\n  DataStoreQuests, v4.2.001\n  DataStoreReputations, v4.2.001\n  DataStoreSpells, v4.2.001\n  DataStoreStats, v4.2.001\n  DataStoreTalents, v4.2.001\n  DBMBurningCrusade, v\n  DBMCore, v\n  DBMLDB, v\n  DBMRaidLeadTools, v\n  DBMSpellTimers, v\n  DebugLib, v5.1.DEV.312(/embedded)\n  Decursive, v2.7.0.3\n  DispelBorder, v1.6.0\n  Dominos, v4.2.3\n  DominosCast, v\n  DominosRoll, v\n  DominosTotems, v\n  DominosXP, v\n  DrDamage, vr1640\n  DungeonHelper, vv2.2\n  Elephant, vr220\n  Enchantrix, v5.12.5198 (QuirkyKiwi)\n  epgp, v5.6.4\n  epgplootmaster, v0.6.15\n  epgplootmasterml, v0.6.15\n  Expose, v\n  Factionizer, v40200.1\n  FBOutfitDisplayFrame, v1.0.4\n  FishingBuddy, v1.0.4\n  ForteCasting, v\n  ForteCooldown, v\n  ForteCore, v1.975.5\n  ForteDeathKnight, v\n  ForteDruid, v\n  ForteHunter, v\n  ForteMage, v\n  FortePaladin, v\n  FortePriest, v\n  ForteRogue, v\n  ForteShaman, v\n  ForteTalent, v\n  ForteWarlock, v\n  ForteWarrior, v\n  Fortress, v1.1.5 \n  Gatherer, v3.2.4\n  GathererHUD, v3.2.4\n  GettingThingsHealed, v2.5.3\n  GhostRecon, v0.10.9\n  GnomishYellowPages, v\n  Grid, v4.2.0.1442\n  GridQuickHealth, v\n  GridCooldownText, v\n  GridManaBars, v1.04\n  GridStatusAFK, v3.2.0.42\n  GridStatusHealingReduced, v4.2.0.62\n  GridStatusHostileUnit, v0.9\n  GridStatusHots, v4.1.0.1b\n  GridStatusRaidDebuff, vv3.2\n  GridStatusRDBC, v1.0.1\n  GridStatusRDCata, v1.3\n  GridStatusRDWotLK, v1.1\n  GridStatusRole, v1.3.3\n  GridStatusShield, v1.23\n  GroupCalendar5, v5.4.3\n  GTHBroker, v1.3\n  GuildBankRepairToggle, v1.0\n  GuildCheck, vv2.32\n  Highlight, v4.2\n  HitsMode5, v5.0\n  HitsMode5Options, v5.0\n  HitsMode5Replay, v5.0\n  InFlightLoad, v4.2.001\n  Informant, v5.12.5198 (QuirkyKiwi)\n  InlineAura, vv1.6.1-3-g0c72c24\n  InlineAuraDefaults, vv1.6.1-3-g0c72c24 \n  InspectEquip, v1.9.4\n  InspectFix, v2.7\n  InterruptNoSpam, v1.4b\n  LibExtraTip, v5.12.DEV.311(/embedded)\n  LilSparkysWorkshop, v\n  LoggerHead, v4.0.128\n  LootLink, v\n  MBB, v\n  Mountiful, vr210\n  MovableBags, v\n  Multishot, vr11\n  oGlow, v2.0.1\n  Omen, v3.1.4\n  OmniCC, v4.2.1\n  oRA3, v\n  Outfitter, v5.3.2\n  Overachiever, v0.64\n  OverachieverTrade, v0.64\n  Panda, v4.2.0.38\n  Possessions, v4.2.0\n  Postal, v3.4.10\n  Prat30, vr876      \n  Prat30HighCPUUsageModules, v\n  Prat30Libraries, v\n  Quartz, v3.0.7\n  QuestGuru, v2.2.3.1\n  QuestGuruTracker, v1.5.6.1\n  RaidAchievement, v1.075\n  RaidAchievementAchieveReminder, v\n  RaidBuffStatus, vv4.16g-beta\n  RaidChecklist, v4.2.0\n  rareannounce, v4.2.0.01\n  RatingBuster, v\n  Raven, v\n  ReagentRestocker, v2.5.7 Beta\n  Recount, v\n  ReforgedTooltip, v1.0.5\n  RobBossMods, v\n  shieldmonitor, v1.10.0\n  SilverDragon, vv2.4.5-20-g9da10e9\n  SimpleRaidTargetIcons, v1.16\n  Skillet, v\n  SlideBar, v5.12.5198 (QuirkyKiwi)\n  SmartRes2, vRelease 1.2.7\n  Stubby, v5.12.5198 (QuirkyKiwi)\n  TidyPlates, v6.3.5 (R296)\n  TidyPlatesGraphite, v\n  TidyPlatesGrey, v\n  TidyPlatesNeon, v\n  TidyPlatesQuatre, v\n  TidyPlatesThreatPlates, v5.2\n  TidyPlatesHub, v\n  TidyPlatesIcon, v\n  TipHelper, v5.12.DEV.310(/embedded)\n  TotemTimers, v10.4.3\n  tullaRange, v4.2.0\n  VisualHeal, v\n  WhatDidIDispel2, v\n  BlizRuntimeLib_enUS v4.2.0.40200 <us>\n  (ck=15a5)\n",
            ["timestamp"] = "2011-08-09 07:43:29",
            ["context"] = "Global",
            ["stack"] = "(tail call): ?\n[C]: ?\n...AddOns\\GnomishYellowPages\\libs\\LibTradeSkillScan.lua:220: in function <...AddOns\\GnomishYellowPages\\libs\\LibTradeSkillScan.lua:215>\n",
        }, -- [94]

Please provide any additional information below.