no such file to load -- hikidoc (LoadError)

/home/ryosuke/linuxdiary/tdiary/wiki_style.rb:12:in `require'
/home/ryosuke/linuxdiary/tdiary/wiki_style.rb:12
/home/ryosuke/linuxdiary/tdiary.rb:442:in `require'
/home/ryosuke/linuxdiary/tdiary.rb:442:in `load_styles'
/home/ryosuke/linuxdiary/tdiary.rb:441:in `glob'
/home/ryosuke/linuxdiary/tdiary.rb:441:in `load_styles'
/home/ryosuke/linuxdiary/tdiary/defaultio.rb:130:in `initialize'
/home/ryosuke/linuxdiary/tdiary.rb:1036:in `new'
/home/ryosuke/linuxdiary/tdiary.rb:1036:in `initialize'
/home/ryosuke/linuxdiary/tdiary.rb:1624:in `initialize'
/home/ryosuke/linuxdiary/tdiary.rb:1864:in `initialize'
/home/ryosuke/linuxdiary/index.rb:46:in `new'
/home/ryosuke/linuxdiary/index.rb:46
/usr/lib/ruby/1.8/apache/ruby-run.rb:53:in `load'
/usr/lib/ruby/1.8/apache/ruby-run.rb:53:in `handler'