Ttitle says it all, I've uploaded the crash report to pastebin.
PasteBin = http://pastebin.com/xNt6M76e
PasteBin = http://pastebin.com/xNt6M76e
well if your mass fab is at those coordinates, then thats where the problem is. you need to remove the mass fab (you can do it with MCEdit, but there may be other tools I am unaware of)