Accelerator has already forgotten your transaction. You can re-braodcast the transaction in hopes that accelerator will be reminded, and then try acceleration again.
I tried rebroadcasting his transaction through every service I can think of, but the transaction accelerator still said it doesn't exist. The blocktrail explorer fee information says the fee contains dust, maybe the viabtc node is configured to ignore such transactions. The accelerator worked for most of the other transactions I submitted.
https://www.blocktrail.com/BTC/tx/dd41c1fda8f1fb73952c54c324571fdfb7b39787859f4aba07a025d2e839f89d
