Chunk Error, zombie spawns ?

[Slutnick]

Hello!! I was playing Direwolf20 Pack when suddenly my power shutdown. after i relogged and it lagged abit, so i did fly around too see if its get better, then i discover this! WTF?
How to remove this chunker error that spawning SHIT load of zombies?
They keep spawning more and more zombies!

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[Lambert2191]

they do say that the first thing to go in a zombie apocalypse is the power

 

[Dravarden]

Also to sethbling happened the same thing, just with bats, no idea what he did but the chunk reseted, hope you don't have something important in it.

 

[Democretes]

You turn the map into a zombie survival map!!

 

[Chocorate]

Try turning off the texture pack, that cow looks scary.