cannibalism pigeon

I traded away my original secret saxton for the bidding on an auction and now it won't let me finish the payment even I got a new one on the site. When I click finish bid, it said "the items no longer in your backpack". What should I do? I got 9 hours left to finish the bid so any help would be appreciated.

Hi there guys, I wanted to start tf2 traiding last week and (beacause I didnt wait enough) I won two auctions by scrap.tf but cannot do the transaction because of steam guard. Sooo anyone have a solution, I already talked withe the two sellers and there quiet nice but I dont want to see like a scammer or an idiot. Thanks for helping