Seems there is a bug in auction house that when I put items on it for selling, it shows error and the items are still in my bag. However when I close the auction hoise and open it again, I saw my items are selling in the auctions option and those items were in my bag too.
I don't know if those items are really selling and how the error occur, but I think it's kind of bug?
And I think my items did sold successfully while i have the same item in my bag.