While running the script, I receive the following error:

Code:
Reading package lists... Done
Building dependency tree       
Reading state information... Done
firefox is already the newest version.
The following packages were automatically installed and are no longer required:
  libevolution3.0-cil linux-headers-2.6.27-7 python-json
  linux-headers-2.6.27-7-generic m4 libwnck2.20-cil libgnomedesktop2.20-cil
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.

Backing up old Firefox preferences

cp: reading `/home/mike/.mozilla/firefox/fvh8gfnv.default/urlclassifier3.sqlite': Input/output error
cp -R ~/.mozilla ~/.mozilla_backup_$(date -Iseconds)
Failed to back up profile.
Process returned code 1
Traceback (most recent call last):
  File "/usr/local/bin/ubuntuzilla.py", line 1294, in <module>
    bs.start()
  File "/usr/local/bin/ubuntuzilla.py", line 300, in start
    fi.start()
  File "/usr/local/bin/ubuntuzilla.py", line 343, in start
    self.install()
  File "/usr/local/bin/ubuntuzilla.py", line 744, in install
    self.backupProfile()
  File "/usr/local/bin/ubuntuzilla.py", line 906, in backupProfile
    self.util.execSystemCommand(executionstring="cp -R ~/.mozilla ~/.mozilla_backup_$(date -Iseconds)", errormessage="Failed to back up profile.")
  File "/usr/local/bin/ubuntuzilla.py", line 143, in execSystemCommand
    raise SystemCommandExecutionError, "Command has not completed successfully. If this problem persists, please seek help at our website, " + self.version.url
__main__.SystemCommandExecutionError: Command has not completed successfully. If this problem persists, please seek help at our website, http://ubuntuzilla.sourceforge.net
/

Any help would be most appreciated