Does not work on Super Ubuntu

[SF007]

I installed Live USB system creator (version 1.0.0) on Super Ubuntu (Live DVD), and it can't create a Live USB, it says
#############
Could not open /cdrom/.disk/info
Please run this application on a Ubuntu live system
or mount a Ubuntu live ISO to /cdrom
############
I think It must be because Super Ubuntu is made with remastersys, and I think the Live CD structure is different from Ubuntu's structure... but I'm not sure...

remastersys: http://www.remastersys.klikit-linux.com/
Super Ubuntu: http://hacktolive.org/su

[probono (probono)]

Remastered Super Ubuntu is not a supported system.

[Carles González Silva (carles-gonzalez)]

Change these lines ->

def determinecaspersize(self):
        """Determine size of casper/ directory"""
        try:
            result = os.popen('du -sh /cdrom/casper').read()
            self.caspersize = int(str.split(result, "M")[0])

for ->

def determinecaspersize(self):
        """Determine size of casper/ directory"""
        try:
            result = os.popen('du -sm /cdrom/casper').read()
            self.caspersize = int(str.split(result)[0])

Casper in SuperUbuntu is bigger of 1GB, these changes work for my

Sorry for my bad english

[SF007 (sf007)]

I tried changing the file:
/usr/share/python-support/liveusb/liveusb.py
Like Carles González Silva suggested, but it did not work :(
Well, thanks anyway... Any other ideas?