World Crashes After World Edit

So after using MCEdit to add a schematic of a mansion, I opened up my world to find it crashes. I tried restarting, and yet, it crashes, please help.

What I expected to happen was...:
What I expected to happen was that I should of seen a big pretty mansion where I put it.

What actually happened was...:
What actually happened was a big lag spike and then an error message.

Steps to Reproduce:
1. Download the schematic from http://www.minecraft-schematics.com/schematic/235/download/
2. Put it in the middle of the desert with a huge piece of grass you also put.
3. Launch the world and watch the crash happen.