http://pastebin.com/5AbUdKH6

from the bottom of the log:

Warning: You have mods that change the behavior of Minecraft, ForgeModLoader, and/or Minecraft Forge to your client:
Bukkit, Cauldron, or other Bukkit replacement
These may have caused this error, and may not be supported. Try reproducing the crash WITHOUT these mods, and report it then.

also BC isn't mentioned at all in the crash

and how is that even connected with BC. I can only see ic2 in this log.

sorry, wrong past bin, also i am downgrade BC and no crash any more

downgrading isn't always the best solution, please provide the correct pastebin and we can investigate a proper fix