Check for two things...
1. That the credits are located in your site Wallet, and not your site Bank.
2. That you have the right amount of credits in your Wallet to cover the time specified for the amount of credits-per-minute being offered.
1/8/15 @ 11:36am
(EST) |UTC - 5:00
Location: California, USA
Posts: 3,429
Agreed with the other poster in this thread regarding the things to check. We looked into the logs for your specific offer and found no bugs, you didn't have enough credits to cover the offer you were making.
Please remember, if you offer say 40cpm for a 5 minute show that means you'd need 200 credits in your wallet to make that offer.