Kanibull

Recently, while playing on the Attack of the B-Team Mod pack, the game crashed. When I tried to reopen the game, the world was missing. After researching the problem, i searched for solutions, all the solutions required searching the saves folder. When i did search the saves folder, the world was missing. Any ideas? I've been working on this world for HOURS Any help and a fast response would be much appreciated. Thanks crash-2015-08-05_18.55.47-server.txt