I was building in my creative flat world, planting carrots. When I placed some next to flowing water, my Minecraft crashed and the world cannot be accessed any more. The crash log is:
If I deselect the Minecraft window, it pauses with a black background, and when I close the menu, I can play for ~2-4 seconds, and then it crashes again.
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That is the full error report. What do you think is missing? I can fix that for a short time. I know how to use NBT software, but I didn't know wat caused the crash. I can delete all iron golems and decrease the number of villagers.

Delete the iron golems, that will fix the problem.

... or make a downdate to 1.4.2 ...
Or reduce particles apparently...
Please post the full report.
But from what I know, duplicate of [MC-1608]