Something Wrong with Industrial Craft 2 and Crafting Tweaks. See in log after 787 line.

Log

It's complaining about Applied Energistics (among others), which I assume you don't have installed. I might have messed up the isModLoaded() check in the latest version, I guess. It should only spam the log a little though and still function correctly.

Of course, I wasn't planning on keeping the error around.

With the game there is no problem, but I think it's better to get rid of this error in the log as cuts my eyes)
P.s. Sorry for my bad Englisg =)