windows buildbot failed to build windows version 2.0.2-813

buildbot failed to build windows build 2.0.2-813 with error

"collecting /cygdrive/c/erl5.8.5.cb1/usr/lib/icons/hrl_icon.ico"
/usr/lib/ruby/1.8/fileutils.rb:500:in `mv': File exists - /opt/couchbase/lib (Errno::EEXIST)
from /usr/lib/ruby/1.8/fileutils.rb:1402:in `fu_each_src_dest'
from /usr/lib/ruby/1.8/fileutils.rb:1416:in `fu_each_src_dest0'
from /usr/lib/ruby/1.8/fileutils.rb:1400:in `fu_each_src_dest'
from /usr/lib/ruby/1.8/fileutils.rb:495:in `mv'
from ./server-win.rb:309
from ./server-win.rb:308:in `each'
from ./server-win.rb:308
Makefile:201: recipe for target `package-win' failed
make: *** [package-win] Error 1
program finished with exit code 2
elapsedTime=2988.406000

http://builds.hq.northscale.net:8010/builders/cs-win2008-x86-20-builder-202/builds/80