MasterMcPvP

Hey. I was just playing Twilight Forest, when my USB Hardware got disconnected. It does it a lot! When i reloaded my Hexxit, i couldnt play my world. It sends error saying that "Excpetion in server tick loop" (Im playing single-player). I tried it 5 times, and always the same outcome. Then i made the new world, and it worked fine. I REALLY WANT THAT OLD SAVE BACK! Can i do everything to restore that world? Plz help...