problem with customizing Linux Live CDs script commands

When I execute bash script line 05, I get the following error

fortenbm@fortenbm-Linux-desktop:~$ sudo mount -t squashfs -o loop ./isomount/casper/filesystem.squashfs ./isonew/squashfs/
[sudo] password for fortenbm:
mount: wrong fs type, bad option, bad superblock on /dev/loop1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

I am doing this in my home directory as suggested in the article.