undefined method `index' for -279519369:Fixnum (NoMethodError)

/usr/local/httpd/htdocs/mini/diary/tdiary.rb:603:in `initialize'
/usr/local/httpd/htdocs/mini/diary/tdiary.rb:915:in `load_plugins'
/usr/local/httpd/htdocs/mini/diary/tdiary.rb:882:in `do_eval_rhtml'
/usr/local/httpd/htdocs/mini/diary/tdiary.rb:854:in `eval_rhtml'
/usr/local/httpd/htdocs/mini/diary/index.rb:71