portsnap on FreeBSD 4.6.2--snapshot corrupt

[Young Sweet and Innocent]

I am trying to use portsnap for the first time and have a "snapshot
corrupt" error:

1. Installed portsnap as
#pkg_add -r portsnap

2.  Copied sample config file to config file

3.  Run portsnap as follows and receive the error message shown.
--begin
mail# portsnap fetch
Looking up portsnap.FreeBSD.org mirrors... none found.
Fetching snapshot tag... done.
Fetching snapshot metadata... done.
Fetching snapshot generated at Wed May  3 08:45:53 HKT 2006:
Receiving 0a8a5ebbe0d881f4affa9ed2f12f6e3733b4e94 (42086089 bytes): 100%
42086089 bytes transferred in 334.7 seconds (122.81 kBps)
Extracting snapshot... tar: snap/ not found in archive
done.
Verifying snapshot integrity...
snap/892dc1f72ce5d20c6db11fd22e92c421077d6991ebc28205c338dea5ec6d5ab8.gz:
No such file or directory
snapshot corrupt.
-- end

Would anyone have any ideas of what I can do to have portsnap work?

Thanks.