LOG: http://pastebin.com/Dd0CZgfs
CRASH: http://pastebin.com/b0K4bm6h

MineFactoryReloaded-[1.7.10]2.8.1B1-125

As demonstrated by this: java.lang.ClassCastException: crazypants.enderio.machine.spawner.TilePoweredSpawner cannot be cast to crazypants.enderio.machine.killera.TileKillerJoe
MFR is not the only mod crashing with nonsense errors. Your world is corrupt.