[Libguestfs] Extlinux with guestfish

Hi everyone, I'm working with libguestfs 1.30.3 on Centos 7 host. I encountered a problem when I wanted to install extlinux with guestfish as a bootloader for my guests and I always get this error: SYSLINUX 4.05 EDD 0x54f93f16 Copyright (C) 1994-2010 H. Peter Anvin et al ERROR: No configuration file found No default or UI configuration directive found! boot: _ *This is how I create the virtual machines:* lvcreate -n vm_name -L 9G vm_volumes parted /dev/vm_volumes/vm_name mklabel msdos parted -a optimal /dev/vm_volumes/vm_name mkpart primary ext4 0% 100% parted /dev/vm_volumes/vm_name set 1 boot on kpartx -av /dev/vm_volumes/vm_name mkfs.ext4 /dev/mapper/loop0p1 mount /dev/mapper/loop0p1 /mnt/clone tar -zxf /root/centos7_template.tar.gz -C /mnt/clone/ umount /mnt/clone kpartx -dv /dev/vm_volumes/vm_name /root/libguestfs-1.30.3/run guestfish -i -a /dev/vm_volumes/{vm_name} << _EOF_ \n\ #####mbr.bin and syslinux already existant in centos7_template.tar.gz#### copy-file-to-device /boot/mbr.bin /dev/sda size:440 \n\ extlinux /boot \n\ part-set-bootable /dev/sda 1 true \n\ _EOF_ *And this is the syslinux.cfg file:* DEFAULT linux LABEL linux SAY Booting the kernel KERNEL /boot/vmlinuz-3.10.0-229.el7.x86_64 INITRD /boot/initramfs-3.10.0-229.el7.x86_64.img APPEND ro root=UUID={{ UUID }} The strange thing is that before I was using a ubuntu 14.04 host with libguestfs 1.24.5 and everything was working fine all my guests worked with extlinux as a bootloader and it's a better solution than grub but when I changed to a Centos7 host the same vm creation script didn't work. I don't know where is the problem, is it from guestfish?? or extlinux?? is there an additional package that I need to install?? Thank you for your time. Best regards, Slim TABKA