ruby and portupgrade

i am trying to do a portupgrade and after it running for 7 hrs and not doing
anything it quits with this error message.

black-buity# portupgrade -aRrcCv                                             
                                                                
--->  Reading default options: -v -D -l /var/tmp/portupgrade.results -L
/var/tmp/portupgrade-%s::%s.log
--->  Session started at: Sat, 15 Jan 2005 12:07:25 -0800
[Updating the pkgdb <format:bdb1_btree> in /var/db/pkg ... - 110 packages
found (-0 +23) ....................... done]
--->  Session ended at: Sat, 15 Jan 2005 19:13:25 -0800 (consumed 07:05:59)
/usr/local/lib/ruby/site_ruby/1.8/pkgdb.rb:323:in `deorigin': cannot convert
nil into String (PkgDB::DBError)
        from /usr/local/lib/ruby/site_ruby/1.8/pkgdb.rb:916:in `tsort_build'
        from /usr/local/lib/ruby/site_ruby/1.8/pkgdb.rb:915:in `each'
        from /usr/local/lib/ruby/site_ruby/1.8/pkgdb.rb:915:in `tsort_build'
        from /usr/local/lib/ruby/site_ruby/1.8/pkgdb.rb:907:in `each'
        from /usr/local/lib/ruby/site_ruby/1.8/pkgdb.rb:907:in `tsort_build'
        from /usr/local/lib/ruby/site_ruby/1.8/pkgdb.rb:929:in `sort_build'
        from /usr/local/lib/ruby/site_ruby/1.8/pkgdb.rb:933:in `sort_build!'
        from /usr/local/sbin/portupgrade:674:in `main'
        from /usr/local/sbin/portupgrade:207:in `initialize'
        from /usr/local/sbin/portupgrade:207:in `new'
        from /usr/local/sbin/portupgrade:207:in `main'
        from /usr/local/sbin/portupgrade:1845
black-buity# 
 
black-buity# ruby --version
ruby 1.8.2 (2004-07-29) [i386-freebsd5]
black-buity# uname -a
FreeBSD black-buity.vampextream.com 5.3-RELEASE FreeBSD 5.3-RELEASE #0: Fri
Dec 10 14:50:33 PST 2004    
root_at_black-buity.vampextream.com:/usr/src/sys/i386/compile/VAMPEXTREAM  i386
black-buity# 

 i have read UPDATEING and didnt find any thing on 1.8 just updateing ruby
from 1.6 to 1.8 ..
so my quistions are

1. what would be causeing this??
2. how do i fix this?


and thanks inadvance for any help on this issue/ error message 








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