strange error message from portupgrade

[Aryeh M. Friedman]

flosoft# portupgrade -a
/usr/local/lib/ruby/site_ruby/1.8/portsdb.rb:119:in `fill': MOVED file 
format error (PortsDB::MOVEDError)
    from /usr/local/lib/ruby/site_ruby/1.8/portsdb.rb:113:in `each'
    from /usr/local/lib/ruby/site_ruby/1.8/portsdb.rb:113:in `fill'
    from /usr/local/lib/ruby/site_ruby/1.8/portsdb.rb:112:in `open'
    from /usr/local/lib/ruby/site_ruby/1.8/portsdb.rb:112:in `fill'
    from /usr/local/lib/ruby/site_ruby/1.8/portsdb.rb:107:in `initialize'
    from /usr/local/lib/ruby/site_ruby/1.8/portsdb.rb:182:in `new'
    from /usr/local/lib/ruby/site_ruby/1.8/portsdb.rb:182:in `setup'
    from /usr/local/lib/ruby/site_ruby/1.8/pkgtools.rb:256:in 
`init_pkgtools_global'
    from /usr/local/sbin/portupgrade:529:in `main'
    from /usr/local/lib/ruby/1.8/optparse.rb:785:in `initialize'
    from /usr/local/sbin/portupgrade:229:in `new'
    from /usr/local/sbin/portupgrade:229:in `main'
    from /usr/local/sbin/portupgrade:2173