freebsd-update upgrade -r 9.0-RC2: incorrect hash error

[Alexander Kapshuk]

when performing a binary upgrade from 9.0-RC1 to 9.0-RC2 by following 
the instructions found here:
http://lists.freebsd.org/pipermail/freebsd-current/2011-November/029373.html

i've had this error:

Applying patches... done.
Fetching 5612 files... gunzip: (stdin): unexpected end of file
137c71ff94c207e764b910e3b7dca9a4fe282e43104bdeb18af4377014033116 has 
incorrect hash.

has anyone else has this error?

what can be done to fix it?

:; uname -a
FreeBSD localhost 9.0-RC1 FreeBSD 9.0-RC1 #0: Tue Oct 18 18:30:38 UTC 
2011     root at obrian.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386


thanks.

sasha kapshuk