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Your map is screwed. Too complicated for me to be able to explain properly, and because of the fact that it doesn't give any location of the item that's floating around in the world, I can't fix it. Sorry. :/
There is Always a way to fix your map, just want to point this out as I don't have time to look with is now.[DOUBLEPOST=1386026157][/DOUBLEPOST]Try deleting the forced chunks.dat and see if the area of this issue doesn't load on startup. Helps narrow it down a bit hopefully.
Try with a standard unleashed mods you have a few extra ones. The error your getting is from a mod that is compiled calling a method that does not exist in the current version, but since it looking for something inside of minecraft it has to be some mod that does ASM integration or wrong version of minecraft.