What is this code?

Evap control system leak (canister)?? I know its something with the pcm..auxiliary emisions control system..section 57. But what is the section 57?

This is from a 1999 Civic DX d16......

Thanks!

The only canister I know of that has to do with emissions is the charcoal canister, it's normally on the firewall, passanger side, lower portion of it, it's a big black round thing with at least one hose going to it.