Hiki Error

premature end of regular expression: /�����/ (RegexpError)
/home/apache/hiki.kataribe.jp/hiki/hiki/storage.rb:64:in `search'
/home/apache/hiki.kataribe.jp/hiki/hiki/storage.rb:62:in `each'
/home/apache/hiki.kataribe.jp/hiki/hiki/storage.rb:62:in `search'
/home/apache/hiki.kataribe.jp/hiki/hiki/storage.rb:55:in `reverse_each'
/home/apache/hiki.kataribe.jp/hiki/hiki/storage.rb:55:in `search'
/home/apache/hiki.kataribe.jp/hiki/hiki/command.rb:398:in `cmd_search'
/home/apache/hiki.kataribe.jp/hiki/hiki/command.rb:108:in `send'
/home/apache/hiki.kataribe.jp/hiki/hiki/command.rb:108:in `dispatch'
/usr/lib/ruby/1.8/timeout.rb:67:in `timeout'
/home/apache/hiki.kataribe.jp/hiki/hiki/command.rb:81:in `dispatch'
/home/apache/hiki.kataribe.jp/hiki/hiki.cgi:32
/home/apache/hiki.kataribe.jp/hiki/hiki/storage.rb:14:in `open_db'
/home/apache/hiki.kataribe.jp/hiki/hiki.cgi:30
/home/apache/hiki.kataribe.jp/www/kataribe/index.cgi:5:in `load'
/home/apache/hiki.kataribe.jp/www/kataribe/index.cgi:5