I crashed and got this report:

Crash Report

I ran into this crash as I was building a BigReactors turbine and I was using WorldEdit to fill in some parts of the turbine such as the glass, and I was supposed to put 478:1 but I accidentally put 478:2 and it crashed and I was unable to go back in the world since then. I tried using MCEdit to replace the blocks to air and it did not work. What can I do?

I'm running a few of the other popular mods such as:

AE2
AM2
Draconic Evolution
OpenBlocks
Minecraft Comes Alive (MCA)
BuildCraft
GalacticCraft
ComputerCraft (Linked to my reactor)
EnderCore (IO & Storage)
ExtraUtilities
CoFHMods (Thermal Foundation, Expansion, Dynamics)
IC2
Magical Crops
NEI
TConstruct
Twilight Forest
Worldedit