xenguest-install.py crashing

[Jason Montleon]

The script is crashing with the error below.  I have no idea what I am doing 
wrong to cause this.  However, the version of the script here: 
http://people.redhat.com/~katzj/xenguest-install.py is working just fine.

Cpl Montleon
USMC

# xenguest-install.py
What is the name of your virtual machine? FC5T2XEN
 How much RAM should be allocated (in megabytes)? 256
 What would you like to use as the disk (path)? /media/FC5T2XEN.DISK
 How large would you like the disk to be (in gigabytes)? 10.0

Traceback (most recent call last):
  File "/usr/sbin/xenguest-install.py", line 357, in ?
    main()
  File "/usr/sbin/xenguest-install.py", line 347, in main
    src = get_paravirt_install(options)
  File "/usr/sbin/xenguest-install.py", line 223, in get_paravirt_install
    if src.startswith("http://") or src.startswith("ftp://"):
AttributeError: 'NoneType' object has no attribute 'startswith'