Loke

So I was making my own private modpack. But when I installed Mo Creatures on it, all regular minecraft sounds disappeared. I can no longer hear a sound when destroying dirt or such. The sound from the mo creatures can still be heard though. I thought this was a problem with mo creatures so I uninstalled it. But I still had no sound. Does anyone know what happened?

When I start creating my server it stops at creating railcraft save. Does anyone know why?