If you get the above error while trying to mount an ISO image, try to the following;
Option 1
MAKEDEV loop (If it doesn’t exist already)
modprobe loop
mount -t iso9660 -o loop yourisofile.iso /mnt/iso
Option 2
cd /dev/;mkdir loop;cd loop;mknod 0 b 7 0
mount -t iso9660 -o loop yourisofile.iso /mnt/iso