Problem with snp.py

[Diego Municio <dmunicio@gmail.com>]

I have been working with the Snarf 'n Pick generator and I get the
following message for i-386 arch:

SCANNING http://ftp.uk.debian.org/debian/dists/testing/main/binary-i386/Packages
Traceback (most recent call last):
  File "./snp.py", line 1897, in ?
    p.load_sources()
  File "./snp.py", line 1090, in load_sources
    d = Source(fields[1], fields[2], fields[3:], self.arch)
  File "./snp.py", line 864, in __init__
    self.add_packages(base, distribution, component, architecture)
  File "./snp.py", line 911, in add_packages
    p.get_file_list()           # Get file list from package
  File "./snp.py", line 800, in get_file_list
    file = File(fileinfo)
  File "./snp.py", line 634, in __init__
    (   self.mode,
AttributeError: 'NoneType' object has no attribute 'groups'

¿what should I do? 
Thanks