WowAce

What steps will reproduce the problem?
1. Fresh install of WoW, no other add ons running or installed.
2. At first login nothing at all happens. No lua error or anything.
3. At second login, the lua error below is displayed, add-on won't run.

What is the expected output? What do you see instead?
Message: Interface\AddOns\QuickAuctions\QuickAuctions.lua:2: Cannot find a library instance of "AceAddon-3.0".
Time: Thu Dec 29 10:33:13 2011
Count: 1
Stack: [C]: in function `error'
...erface\AddOns\QuickAuctions\libs\LibStub\LibStub.lua:38: in function `LibStub'
Interface\AddOns\QuickAuctions\QuickAuctions.lua:2: in main chunk

Locals: (*temporary) = "Cannot find a library instance of "AceAddon-3.0"."

What version of the product are you using?
3.1

Do you have an error log of what happened?
Yes, see above.

Please provide any additional information below.

It seems that Ace3 library isn't properly included. If I add it as a stand alone, it works.