Iphone 4 /System/Library/Audio Folder

Hi. I jailbroke my Iphone 4 the other day, and everything was fine until last night. I realized that none of my sounds, other than phone calls, were working. I downloaded iFile and notice that the /System/Library/Audio folder was missing; it is not there at all.

I was wondering if anyone had the original Audio folder they could send me. If so, can you then explain to me how to get it back into my Iphone.

Thanks.

 

I'm trying to avoid that if at all possible. If not, that is what I guess I will have to do. I have no idea what caused this to happen though. Thanks.