jquery.ui.all couldnt be found

Question

I am new to Ruby on rails, and my task is to refactor some code in an already existing app, so am dealing with code that I did not write. Anyway, the problem is that when I try to run a specific page the error "couldn't find file 'jquery.ui.all', the gemfile contains :gem 'jquery-rails' and gem 'jquery-ui-rails' and my application.js and .css manifest files contains "require jquery.ui.all" but the error keeps appearing. I am using:

rails (4.0.3) jquery-rails (3.1.4) jquery-ui-rails (5.0.5)

Those are my manifest files:

Application.js:

//= require jquery
//= require jquery-ui
//= require jquery.ui.all
//= require jquery_ujs
//= require turbolinks
//= require analytics

Application.css.scss:

/*
 *= require_self
 *= require_tree
*/

//= require jquery-ui   

The error is: couldn't find file 'jquery.ui.all' (in /home/haytham/Desktop/LadyPool/com.emiketic-services.rails.flp/app/assets/javascripts/application.js:16)