An ActionView::Template::Error occurred in posts#index: couldn't find file 'jquery' (in /opt/ruby_apps/bookdate-website/app/assets/javascripts/cpanel_app.coffee:1) sprockets (2.1.3) lib/sprockets/context.rb:100:in `resolve' An ActionView::Template::Error occurred in topics#show: cannot load such file -- html/tokenizer actionpack (3.2.8) lib/action_controller/vendor/html-scanner/html/sanitizer.rb:18:in `tokenize' sometimes there is an exception thrown like the one mentioned above,but sometime it works why? my ruby environment is ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux] Rails 3.2.8