[CentOS] mkbootdisk error????

we have CENTOS 5.10 on server.   I tried to created bootable CD and have error.  Any ideal?

#mkbootdisk --verbose --iso --device /tmp/boot.iso 2.6.18-371.1.2.el5
Installing isolinux... cp: cannot stat `/usr/lib/syslinux/isolinux.bin': No such file or directory
done
Copying /boot/vmlinuz-2.6.18-371.1.2.el5... done.
Copying /boot/initrd-2.6.18-371.1.2.el5.img... done.
Configuring bootloader... done.
mkisofs: Uh oh, I cant find the boot image 'isolinux/isolinux.bin' !