Problem upgrading from 10.1 to 10.2

[George]

Hi guys,

I have tried this already 10 times and have deleted the same offending
file and tried hard setting the update server number and by this time,
with so many attempts, the choosing algorithm has gone through all of
them and I am still getting this:

root at asrock-lan:~ # freebsd-update -r 10.2-RELEASE upgrade
Looking up update.freebsd.org mirrors... 5 mirrors found.
Fetching metadata signature for 10.1-RELEASE from
update5.freebsd.org... done. Fetching metadata index... done.
Fetching 2 metadata patches.. done.
Applying metadata patches... done.
Fetching 1 metadata files... done.
Inspecting system... done.

The following components of FreeBSD seem to be installed:
kernel/generic src/src world/base world/doc world/games world/lib32

The following components of FreeBSD do not seem to be installed:

Does this look reasonable (y/n)? y

Fetching metadata signature for 10.2-RELEASE from
update5.freebsd.org... done. Fetching metadata index... done.
Fetching 1 metadata patches. done.
Applying metadata patches... done.
Fetching 1 metadata files... done.
Inspecting system... done.
Fetching files from 10.1-RELEASE for merging... done.
Preparing to download files... done.
Fetching 103
patches.....10....20....30....40....50....60....70....80....90....100.
done. Applying patches... done. Fetching 4720 files... gunzip: unknown
compression format
143f5cd95cd065b2adb90da82ee4b22489babe56a27ec97cbbecd7b55e72ed94 has
incorrect hash.
root at asrock-lan:~ # uname -a
FreeBSD asrock-lan 10.1-RELEASE-p19 FreeBSD 10.1-RELEASE-p19 #0: Sat
Aug 22 03:55:09 UTC 2015
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

I have seen the posting on the forum about lighthttpd not working as
expected and that everything is switched to Nginx but I am still having
an issue.

Any ideas what I can do from here?
TIA
George