couldn't find file 'jquery.ui.effect-blind' with type 'application/javascript'

I think you are using new version (your version > 2.3.0) of jquery-rails.

jQuery UI has been removed from jquery-rails gem,

• ≤ jquery-rails v2.3.0 still have jQuery UI
• ≥ jquery-rails v3.0.0 jQuery UI removed

Take a look this commit.

If you are using ≥ jquery-rails v3.0.0 or latest version of jquery-rails

You should use jquery-ui-rails gem for using jquery UI in rails, https://github.com/joliss/jquery-ui-rails.

In your Gemfile, add:

gem 'jquery-ui-rails'

and run bundle install

1. v2.3.0 < your version ≤ v4.2.1

   And put this into application.js

   //= require jquery.ui.all

   then put this into application.css

   *= require jquery.ui.all

2. ≥ jquery-ui-rails v5.0.0 or latest version

   And put this into application.js

   //= require jquery-ui

   then put this into application.css

   *= require jquery-ui

   or to use specific modules read this

Don't forget restart your server.

If you are using ≤ jquery-rails v2.3.0

see my answer here http://stackoverflow.com/a/16996710/1297435 for use gem 'jquery-rails', "~> 2.3.0"