Portupgrade problems

I have been having a problem with portugrade for a couple of weeks. I get the 
following error when trying to update ports. I have updated ports, deleted 
the entire /usr/ports/ dir, rm -f pkgdb and /usr/ports/ INDEX file. Did not 
see any other possible soulutions. Can someone point me in the right 
direction. Would like to have updated ports.
Thanks Dantavious 



derrick_at_/usr/ports/sysutils/portupgrade: portupgrade -arR
[Updating the pkgdb <format:bdb1_btree> in /var/db/pkg ... - 299 packages 
found (-1 +1) (...). done]
/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