[ubuntu] Problems to create a DVD multiboot

Hi Community,

I have been trying to create a DVD multiboot with the multicd tool.
I'm following this steps http://http://multicd.tuxfamily.org/#Instructions

But the console shows always that:

cp: fallo al extender «/home/breixo/Documentos/mydvd/MultiCD/multicd-working/boot/i386.l.ubuntu/vmlinuz»: Error de entrada/salida

"Error Input/Output" for the english speakers... or something like that

What do I miss out? Any Help would be greatly appreciated

-Regards