Hey All

I'm following this guide to customizing a live cd: https://help.ubuntu.com/community/LiveCDCustomization
I get to this step:
Extract the SquashFS filesystem
Code:
sudo unsquashfs mnt/casper/filesystem.squashfs
sudo mv squashfs-root edit
And I'm told that the filesystem is too new for squashfs to support. I'm running 9.10 and the image I'm working with is also of 9.10. I've just updated all my programs.
If anyone knows how to solve this, I'd appreciate it.
Thanks.