When i enter this area chunks do not load on the one y axis not sure if it is a problem with my world but thought i let everyone know.I have tried restarting the game and leaving the area and unloading the chunks as well f3+a to reload but nothing seems to work.I have included a screenshot and did a forced crash and have supplied my log.
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Your world seems to be corrupt.
In that case, you can ask for it to be recovered here: http://www.minecraftforum.net/topic/137381-official-corrupted-save-recovery-thread/

Duplicate of MC-2545