Not sure if its you, posting anyways.
 

Not sure if its a conflict in mods I use but figured I'd post just in case. :)

Date: 2011-07-14 21:10:18
ID: 1
Error occured in: Global
Count: 1
Message: ...face\AddOns\Blizzard_InspectUI\InspectGuildFrame.lua line 18:
Usage: GetGuildInfo("unit")
Debug:
[C]: ?
[C]: GetGuildInfo()
...face\AddOns\Blizzard_InspectUI\InspectGuildFrame.lua:18: InspectGuildFrame_Update()
...face\AddOns\Blizzard_InspectUI\InspectGuildFrame.lua:8:
...face\AddOns\Blizzard_InspectUI\InspectGuildFrame.lua:6
AddOns:
Swatter, v5.12.5198 (QuirkyKiwi)
AucAdvanced, v5.12.5198 (QuirkyKiwi)
AucFilterBasic, v5.12.5198 (QuirkyKiwi)
AucFilterOutlier, v5.12.5198.5194(5.12/embedded)
AucMatchUndercut, v5.12.5198.4828(5.12/embedded)
AucScanData, v5.12.5198 (QuirkyKiwi)
AucStatHistogram, v5.12.5198 (QuirkyKiwi)
AucStatiLevel, v5.12.5198 (QuirkyKiwi)
AucStatPurchased, v5.12.5198 (QuirkyKiwi)
AucStatSales, v5.12.5198.4838(5.12/embedded)
AucStatSimple, v5.12.5198 (QuirkyKiwi)
AucStatStdDev, v5.12.5198 (QuirkyKiwi)
AucStatWOWEcon, v5.12.5198.4828(5.12/embedded)
AucUtilAHWindowControl, v5.12.5198.5133(5.12/embedded)
AucUtilAppraiser, v5.12.5198.5194(5.12/embedded)
AucUtilAskPrice, v5.12.5198.5162(5.12/embedded)
AucUtilAutoMagic, v5.12.5198.5184(5.12/embedded)
AucUtilCompactUI, v5.12.5198.5016(5.12/embedded)
AucUtilEasyBuyout, v5.12.5198.4897(5.12/embedded)
AucUtilFixAH, v5.12.5198 (QuirkyKiwi)
AucUtilItemSuggest, v5.12.5198.5144(5.12/embedded)
AucUtilPriceLevel, v5.12.5198.4861(5.12/embedded)
AucUtilScanButton, v5.12.5198.5159(5.12/embedded)
AucUtilScanFinish, v5.12.5198.5159(5.12/embedded)
AucUtilScanProgress, v5.12.5198.4979(5.12/embedded)
AucUtilScanStart, v5.12.5198.5159(5.12/embedded)
AucUtilSearchUI, v5.12.5198.5184(5.12/embedded)
AucUtilSimpleAuction, v5.12.5198.4993(5.12/embedded)
AucUtilVendMarkup, v5.12.5198.4828(5.12/embedded)
Babylonian, v5.1.DEV.312(/embedded)
Bagnon, v4.2.4
BagnonForever, v4.2.4
BagnonTooltips, v
BeanCounter, v5.12.5198 (QuirkyKiwi)
Configator, v5.1.DEV.312(/embedded)
DebugLib, v5.1.DEV.312(/embedded)
Enchantrix, v5.12.5198 (QuirkyKiwi)
EnchantrixBarker, v5.12.5198 (QuirkyKiwi)
HealBot, v4.2.0.1
Informant, v5.12.5198 (QuirkyKiwi)
LibExtraTip, v5.12.DEV.311(/embedded)
nUI, v5.07.20 (Plus)
nUIDragon, v5.07.18
nUIInfoPanelDualStats, v5.07.18
Omen, v3.1.4
Recount, v
SlideBar, v5.12.5198 (QuirkyKiwi)
Stubby, v5.12.5198 (QuirkyKiwi)
TipHelper, v5.12.DEV.310(/embedded)
BlizRuntimeLib_enUS v4.2.0.40200 <us>
(ck=7f1)

It's not us, just you.

InspectFix should do the trick.

Ok. When my net decides to work properly I'll look at it. Had another error. xD Again, dunno who's the cause I can't make sense of it all like you pros can. Lol.

Date: 2011-07-15 14:52:01
ID: 1
Error occured in: Global
Count: 1
Message: ..\FrameXML\ChatFrame.lua line 3792:
attempt to perform arithmetic on a nil value
Debug:
[C]: ?
..\FrameXML\ChatFrame.lua:3792: ChatEdit_UpdateHeader()
..\FrameXML\ChatFrame.lua:3517: ChatEdit_ResetChatType()
..\FrameXML\ChatFrame.lua:3589:
..\FrameXML\ChatFrame.lua:3573
..\FrameXML\ChatFrame.lua:3599: ChatEdit_DeactivateChat()
..\FrameXML\InterfaceOptionsPanels.lua:977: InterfaceOptionsSocialPanelChatStyle_SetChatStyle()
..\FrameXML\InterfaceOptionsPanels.lua:906:
..\FrameXML\InterfaceOptionsPanels.lua:893
AddOns:
Swatter, v5.12.5198 (QuirkyKiwi)
AucAdvanced, v5.12.5198 (QuirkyKiwi)
AucFilterBasic, v5.12.5198 (QuirkyKiwi)
AucFilterOutlier, v5.12.5198.5194(5.12/embedded)
AucMatchUndercut, v5.12.5198.4828(5.12/embedded)
AucStatHistogram, v5.12.5198 (QuirkyKiwi)
AucStatiLevel, v5.12.5198 (QuirkyKiwi)
AucStatPurchased, v5.12.5198 (QuirkyKiwi)
AucStatSales, v5.12.5198.4838(5.12/embedded)
AucStatSimple, v5.12.5198 (QuirkyKiwi)
AucStatStdDev, v5.12.5198 (QuirkyKiwi)
AucStatWOWEcon, v5.12.5198.4828(5.12/embedded)
AucUtilAHWindowControl, v5.12.5198.5133(5.12/embedded)
AucUtilAppraiser, v5.12.5198.5194(5.12/embedded)
AucUtilAskPrice, v5.12.5198.5162(5.12/embedded)
AucUtilAutoMagic, v5.12.5198.5184(5.12/embedded)
AucUtilCompactUI, v5.12.5198.5016(5.12/embedded)
AucUtilEasyBuyout, v5.12.5198.4897(5.12/embedded)
AucUtilFixAH, v5.12.5198 (QuirkyKiwi)
AucUtilItemSuggest, v5.12.5198.5144(5.12/embedded)
AucUtilPriceLevel, v5.12.5198.4861(5.12/embedded)
AucUtilScanButton, v5.12.5198.5159(5.12/embedded)
AucUtilScanFinish, v5.12.5198.5159(5.12/embedded)
AucUtilScanProgress, v5.12.5198.4979(5.12/embedded)
AucUtilScanStart, v5.12.5198.5159(5.12/embedded)
AucUtilSearchUI, v5.12.5198.5184(5.12/embedded)
AucUtilSimpleAuction, v5.12.5198.4993(5.12/embedded)
AucUtilVendMarkup, v5.12.5198.4828(5.12/embedded)
Babylonian, v5.1.DEV.312(/embedded)
Bagnon, v4.2.4
BagnonForever, v4.2.4
BagnonTooltips, v
BeanCounter, v5.12.5198 (QuirkyKiwi)
Configator, v5.1.DEV.312(/embedded)
DBMCore, v
DebugLib, v5.1.DEV.312(/embedded)
Enchantrix, v5.12.5198 (QuirkyKiwi)
EnchantrixBarker, v5.12.5198 (QuirkyKiwi)
HealBot, v4.2.0.1
Informant, v5.12.5198 (QuirkyKiwi)
LibExtraTip, v5.12.DEV.311(/embedded)
nUI, v5.07.20 (Plus)
nUIDragon, v5.07.18
nUIInfoPanelDualStats, v5.07.18
Omen, v3.1.4
Recount, v
SlideBar, v5.12.5198 (QuirkyKiwi)
Stubby, v5.12.5198 (QuirkyKiwi)
TipHelper, v5.12.DEV.310(/embedded)
BlizRuntimeLib_enUS v4.2.0.40200 <us>
(ck=7d7)

What addon are you using for chat config?

None. Don't really use chat addons since I can just make windows by default to organize and review past history if need be. Give me a moment and I'll list all I use.

Auctioneer
Bagnon
Healbot
nUI+ <3
Omen3
Recount
nUI info dual stats
nUI Dragon
Deadly Boss Mod

Thats it. =\

Update all of them is my guess.

Try disabling all your addons and then turn them back on one at a time until you get the error again. That's the best way to track down which one it is.

I *think* I have figured out what's going on here.

Out of curiosity, is this error only occurring when you click on the combat log? Or are you seeing it in other places too?

Honestly I usually get the error as soon as I log in or in combat. I've not updated to the new version as of today. The great thing about the error is it doesn't break anything. Just gets in the way. Lol. Thank you all for your assistance and I'll report back after I've updated and played a bit.

Edit - So after logging in and getting into heavy combat I didn't get the error. Think the update fixed it. :) Thanks again all for the help. :)