What steps will reproduce the problem?
It happens after I log into my character. Even if I don't touch keyboard and mouse after hitting enter world.

What version of the product are you using?
3.4.29 - Latest according to Curse client.

Do you have an error log of what happened?
Date: 2016-10-10 01:17:54
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\ACP\ACP.lua line 22:
   AddOn index must be in the range of 1 to 205
Debug:
   [C]: ?
   [C]: GetAddOnMetadata()
   ACP\ACP.lua:22 SpecialCaseName()
   ACP\ACP.lua:1085
      ACP\ACP.lua:1079
   [C]: sort()
   ACP\ACP.lua:1079 func()
   ACP\ACP.lua:1206 ReloadAddonList()
   ACP\ACP.lua:650 OnEvent()
   [string "*:OnEvent"]:1:
      [string "*:OnEvent"]:1
Locals:

AddOns:
  MoncaiCompare, v7.0.1
  Swatter, v7.1.5675 (TasmanianThylacine)
  2048, v1.1.0
  AckisRecipeList, v7.0.3.8
  ACP, v3.4.29
  Archy, v7.0.3.16
  Atlas, v1.34.04
  AtlasArena, v1.06.02
  AtlasBattlegrounds, v1.34.00
  AtlasBurningCrusade, v1.34.00
  AtlasCataclysm, v1.34.00
  AtlasClassicWoW, v1.34.00
  AtlasClassOrderHalls, v1.34.08
  AtlasDungeonLocs, v1.34.03
  AtlasLegion, v1.34.08
  AtlasMistsofPandaria, v1.34.00
  AtlasOutdoorRaids, v1.34.00
  AtlasScenarios, v1.34.02
  AtlasTransportation, v1.34.04
  AtlasWarlordsofDraenor, v1.34.00
  AtlasWorldEvents, v3.16
  AtlasWrathoftheLichKing, v1.34.00
  AtlasLoot, vv8.01.04
  AtlasMajorCitiesEnhanced, vv1.09
  AtlasQuest, v4.10.10
  AucAdvanced, v7.1.5675 (TasmanianThylacine)
  AucFilterBasic, v7.1.5675 (TasmanianThylacine)
  AucFilterOutlier, v7.1.5675.5459(7.1/embedded)
  AucMatchUndercut, v7.1.5675.5585(7.1/embedded)
  AucStatHistogram, v7.1.5675 (TasmanianThylacine)
  AucStatiLevel, v7.1.5675 (TasmanianThylacine)
  AucStatPurchased, v7.1.5675 (TasmanianThylacine)
  AucStatSales, v7.1.5675.5598(7.1/embedded)
  AucStatSimple, v7.1.5675 (TasmanianThylacine)
  AucStatStdDev, v7.1.5675 (TasmanianThylacine)
  AucStatWOWEcon, v7.1.5675.5613(7.1/embedded)
  AucUtilAHWindowControl, v7.1.5675.5575(7.1/embedded)
  AucUtilAppraiser, v7.1.5675.5666(7.1/embedded)
  AucUtilAskPrice, v7.1.5675.5599(7.1/embedded)
  AucUtilAutoMagic, v7.1.5675.5587(7.1/embedded)
  AucUtilCompactUI, v7.1.5675.5629(7.1/embedded)
  AucUtilEasyBuyout, v7.1.5675.5576(7.1/embedded)
  AucUtilFixAH, v7.1.5675 (TasmanianThylacine)
  AucUtilItemSuggest, v7.1.5675.5651(7.1/embedded)
  AucUtilPriceLevel, v7.1.5675.5633(7.1/embedded)
  AucUtilScanButton, v7.1.5675.5631(7.1/embedded)
  AucUtilScanFinish, v7.1.5675.5588(7.1/embedded)
  AucUtilScanProgress, v7.1.5675.4979(7.1/embedded)
  AucUtilScanStart, v7.1.5675.5347(7.1/embedded)
  AucUtilSearchUI, v7.1.5675.5672(7.1/embedded)
  AucUtilSimpleAuction, v7.1.5675.5654(7.1/embedded)
  AucUtilVendMarkup, v7.1.5675.4828(7.1/embedded)
  AutoLootPlus, v1.1.0
  Babylonian, v5.1.DEV.332(/embedded)
  BagBrother, v
  Bagnon, v7.0.4
  Bartender4, v4.7.2
  BeanCounter, v7.1.5675 (TasmanianThylacine)
  Breakables, v1.4.3 (Revision: @project-revision@)
  CanIMogIt, v7.0.3.23
  Configator, v5.1.DEV.406(/embedded)
  Coordinates, v1.20
  Currency, v7.0.3a
  DBMCore, v
  DBMDefaultSkin, v
  DBMStatusBarTimers, v
  DBMVPVEM, v6.99.1
  DebugLib, v5.1.DEV.337(/embedded)
  DugisGuideViewerZ, v4.030
  EasyObliterate, v1.5
  Enchantrix, v7.1.5675 (TasmanianThylacine)
  EnchantrixBarker, v7.1.5675 (TasmanianThylacine)
  FishingBuddy, v1.7.9
  GatherMate2, v1.37.1
  Grail, v081
  GrailReputations, v007
  HandyNotes, vv1.4.9
  HandyNotesDraenorTreasures, v1.20
  HandyNotesLegionRaresTreasures, v1.01a
  HandyNotesPandariaTreasures, v1.06
  HealersHaveToDie, v2.4.2
  KuiNameplates, v
  KuiNameplatesCore, v
  KuiNameplatesCoreConfig, v
  LibExtraTip, v5.12.DEV.412(/embedded)
  Mapster, v1.7.2
  MasterPlanA, vA
  MBB, v
  MikScrollingBattleText, v5.7.146
  MineSweeper, v3.0.0
  mOnArsWardrobeHelper, v1.16.2
  NeedToKnow, v4.0.26
  NPCScan, v7.0.3.24
  OmniCC, v7.0.1
  Overachiever, v0.96
  Postal, vv3.5.8
  Prat30, v3.6.15    
  Prat30Libraries, v
  Recount, vv7.0.3k release
  ShadowedUnitFrames, vv4.1.10
  SimpleILevel, v3.3.4
  SimpleILevelGroup, v3.3.4
  SimpleILevelResilience, v3.3.4
  SimpleILevelSocial, v3.3.4
  Stubby, v7.1.5675 (TasmanianThylacine)
  Telemancy, v1.1.0
  TheUndermineJournal, v4.7.20161008
  TierTokenTooltip, v1.05
  TipHelper, v5.12.DEV.405(/embedded)
  TradeSkillMaster, vv3.6.8
  TradeSkillMasterAccounting, vv3.0.16
  TradeSkillMasterAppHelper, vv3.0.1
  TradeSkillMasterAuctionDB, vv3.1.13
  TradeSkillMasterAuctioning, vv3.0.13
  TradeSkillMasterCrafting, vv3.1.16
  TradeSkillMasterDestroying, vv3.1.4
  TradeSkillMasterMailing, vv3.0.12
  TradeSkillMasterShopping, vv3.4.1
  TradeSkillMasterVendoring, vv3.0.3
  TradeSkillMasterWarehousing, vv3.0.3
  Wholly, v058
  WorldQuestTracker, v
  XLoot, v7.0-11
  XLootFrame, v7.0-11
  XLootGroup, v7.0-11
  XLootMaster, v7.0-11
  XLootMonitor, v7.0-11
  BlizRuntimeLib_enUS v7.0.3.70000 <none>
  (ck=103f)