WowAce

I get errors like this randomly in raids. Unsure what exactly is causing it;

Date: 2015-07-20 08:07:03
ID: 1
Error occured in: Global
Count: 1
Message: ..\AddOns\XPerl\XPerl_Highlight.lua line 32:
   attempt to call global 'GetNumTalents' (a nil value)
Debug:
   XPerl\XPerl_Highlight.lua:32:
      XPerl\XPerl_Highlight.lua:30
   XPerl\XPerl_Highlight.lua:43:
      XPerl\XPerl_Highlight.lua:41
   XPerl\XPerl_Highlight.lua:53: GetModifier()
   XPerl\XPerl_Highlight.lua:62: GetRankAmount()
   XPerl\XPerl_Highlight.lua:1494: ev()
   XPerl\XPerl_Highlight.lua:1305: ?()
   XPerl\XPerl_Highlight.lua:1283:
      XPerl\XPerl_Highlight.lua:1282
Locals:
findName = nil
(for index) = 1
(for limit) = 3
(for step) = 1
i = 1
(*temporary) = 1
(*temporary) = nil
(*temporary) = 1
(*temporary) = "attempt to call global 'GetNumTalents' (a nil value)"

AddOns:
  Swatter, v5.21e.5566 (SanctimoniousSwamprat)
  WowheadLooter, v50006
  NPCScan, v6.2.0.2
  AucAdvanced, v5.21e.5566 (SanctimoniousSwamprat)
  AucFilterBasic, v5.21e.5566 (SanctimoniousSwamprat)
  AucFilterOutlier, v5.21e.5566.5459(5.21e/embedded)
  AucMatchUndercut, v5.21e.5566.5507(5.21e/embedded)
  AucScanData, v5.21e.5566 (SanctimoniousSwamprat)
  AucStatHistogram, v5.21e.5566 (SanctimoniousSwamprat)
  AucStatiLevel, v5.21e.5566 (SanctimoniousSwamprat)
  AucStatPurchased, v5.21e.5566 (SanctimoniousSwamprat)
  AucStatSales, v5.21e.5566.5476(5.21e/embedded)
  AucStatSimple, v5.21e.5566 (SanctimoniousSwamprat)
  AucStatStdDev, v5.21e.5566 (SanctimoniousSwamprat)
  AucStatWOWEcon, v5.21e.5566.5323(5.21e/embedded)
  AucUtilAHWindowControl, v5.21e.5566.5347(5.21e/embedded)
  AucUtilAppraiser, v5.21e.5566.5545(5.21e/embedded)
  AucUtilAskPrice, v5.21e.5566.5447(5.21e/embedded)
  AucUtilAutoMagic, v5.21e.5566.5537(5.21e/embedded)
  AucUtilCompactUI, v5.21e.5566.5550(5.21e/embedded)
  AucUtilEasyBuyout, v5.21e.5566.5507(5.21e/embedded)
  AucUtilFixAH, v5.21e.5566 (SanctimoniousSwamprat)
  AucUtilItemSuggest, v5.21e.5566.5417(5.21e/embedded)
  AucUtilPriceLevel, v5.21e.5566.5535(5.21e/embedded)
  AucUtilScanButton, v5.21e.5566.5403(5.21e/embedded)
  AucUtilScanFinish, v5.21e.5566.5515(5.21e/embedded)
  AucUtilScanProgress, v5.21e.5566.4979(5.21e/embedded)
  AucUtilScanStart, v5.21e.5566.5347(5.21e/embedded)
  AucUtilSearchUI, v5.21e.5566.5556(5.21e/embedded)
  AucUtilSimpleAuction, v5.21e.5566.5531(5.21e/embedded)
  AucUtilVendMarkup, v5.21e.5566.4828(5.21e/embedded)
  Babylonian, v5.1.DEV.332(/embedded)
  BagBrother, v
  Bagnon, v6.2.1
  Bartender4, v4.6.10
  BattlegroundTargets, v60100-4
  BeanCounter, v5.21e.5566 (SanctimoniousSwamprat)
  Configator, v5.1.DEV.382(/embedded)
  Cooldowns, v
  Coordinates, v1.19
  DBMBlackrockFoundry, v
  DBMCore, v
  DBMDefaultSkin, v
  DBMGarrisonInvasions, v
  DBMStatusBarTimers, v
  DebugLib, v5.1.DEV.337(/embedded)
  ElkBuffBars, v2.4.2-185
  Enchantrix, v5.21e.5566 (SanctimoniousSwamprat)
  EnchantrixBarker, v5.21e.5566 (SanctimoniousSwamprat)
  HandyNotes, vv1.3.3
  HandyNotesDraenorTreasures, v1.14a
  Informant, v5.21e.5566 (SanctimoniousSwamprat)
  LibAboutPanel, v1.6.2
  LibActionButton10, v
  LibDBIcon10, v
  LibExtraTip, v5.12.DEV.390(/embedded)
  LibKeyBound10, v
  LibSharedMedia30, v3.0-93
  LibStub, v
  LibWindow11, v1.1.12
  MailOpener, vv1.2.16
  MasterPlanA, v
  Recount, vv6.2.0f release
  sct, v6.72
  sctd, v6.72
  SlideBar, v5.21e.5566 (SanctimoniousSwamprat)
  Stubby, v5.21e.5566 (SanctimoniousSwamprat)
  TipHelper, v5.12.DEV.389(/embedded)
  Titan, v5.6.8.60200
  TitanBag, v5.6.8.60200
  TitanClock, v5.6.8.60200
  TitanGold, v5.6.8.60200
  TitanLocation, v5.6.8.60200
  TitanLootType, v5.6.8.60200
  TitanPerformance, v5.6.8.60200
  TitanRepair, v5.6.8.60200
  TitanVolume, v5.6.8.60200
  TitanXP, v5.6.8.60200
  XPerl, v3.7.5
  XPerlArcaneBar, v
  XPerlCustomHighlight, v
  XPerlParty, v
  XPerlPartyPet, v
  XPerlPlayer, v
  XPerlPlayerBuffs, v
  XPerlPlayerPet, v
  XPerlRaidAdmin, v
  XPerlRaidFrames, v
  XPerlRaidHelper, v
  XPerlRaidMonitor, v
  XPerlRaidPets, v
  XPerlTarget, v
  XPerlTargetTarget, v
  BlizRuntimeLib_enUS v6.2.0.60200 <none>
  (ck=cb3)