I've been hunting down that error for ages... as has the CE community in general (at least 5 or 6 threads at Gearbox about it...)

The only thing I've picked up from them is the possibility of a physics tag being involved. Though, if you open up tool in notepad and ctrl+f the error (something I always do when dealing with these obscure errors - it may be the equalivalent of voodoo but sometimes it helps me find a solution) it's next to a bunch of memory size errors.