scat.rb ERROR

invalid byte sequence in EUC-JP /usr/local/lib/clipnews/mail2html.rb:17:in `gsub' /usr/local/lib/clipnews/mail2html.rb:17:in `quote' /usr/local/lib/clipnews/mail2html.rb:317:in `str_from' /usr/local/lib/clipnews/mail2html.rb:523:in `hhead' /usr/lib/cgi-bin/scat.rb:257:in `sprint' /usr/lib/cgi-bin/scat.rb:335:in `
'