Gemfile updated, error doing bundle install

Question

I´m totally lost so i will try to explain my problem. Actually im reading the book Ruby on Rails tutorial. I´m actually installing all the environment to start learning this language.

The book asks me to update the Gemfile, and add this

  group :assets do
    gem 'sass-rails',   '3.2.4'
    gem 'coffee-rails', '3.2.2'
    gem 'uglifier', '1.2.3'
    end

So i delete my old gem sass-rails, my old gem coffee-rails and my old gem uglifier. After doing this the book asks me to save it and run Bundle install on my console.

After doing this i get this message:

You have requested:  
    coffee-rails = 3.2.2

The bundle currently has coffee-rails locked at 4.0.1.
Try running `bundle update coffee-rails`

So i´m totally lost, and i have no idea what i´m doing cause im only following the steps from the book. Someone could help me and tell me what i should do here? Why the book is asking me to do all this if then it does´t work?

Answer 1

Sounds like you have already done a bundle install on a newer (probably without the version requirement) of coffee-rails and that is currently locked down in your Gemfile.lock file.

Do what it says and run bundle update coffee-rails to update your Gemfile.lock file to the version you specify