ic2 crash in multimc instance.

i tried to install build 304 of IC2 in my multimc intance, and it crashed. but in a clean instance, only with Ic2 and forge, it worked. i tryed to update forge, delete opifine, nothing helped.
multiMC console:
http://pastebin.com/tDSCKfUH

minecraft crash report:
http://pastebin.com/JDB022wb

mod list:
http://pastebin.com/d1RmkpxN

Quote from Nargon

Code

Slot 243 is already occupied by ic2.core.block.BlockRubWood@269f379b when adding codechicken.chunkloader.BlockChunkLoader@4a5a796

Collision ID.
You tried reconfiguring ID? No? Try it! It will work.

i did it, still crash. i think it's beacuse the id i gave chunkloader is also taken.
edit: it's fine now thanks.