Forum:Player getting kicked when trying to make a disk drive. Help?

Hello. I'm running a tekkit server, with everything up-to-date as of today (October 2nd, 2012). One of the players is trying to make a computer, and therefore has to make a disk drive, first. When he tries to do so, he get's kicked. He's getting a java error, but I'm not sure exactly what is. (I'll get it from him as soon as I can.) Essentially, it was a pointer error. Essentially, he tries to click on an item in the crafting table and gets an end of stream. Does anybody have advice on where to start looking for the root of the problem? If anybody has experience a problem similar to this and has a solution, that would be great.

Thanks in advance!