"Could not find a JavaScript runtime." during executing the refinerycms command - refinerycms

Question

I am working on Ubuntu 12.04.
I am trying to create a new website with Refinery CMS.
I read the official Getting Started guide, and executed the following command.
$ refinerycms rickrockstar
But I got the following error message:
Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.
rake db:create
rake aborted!
Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes.
(See full trace by running task with --trace)
generate refinery:cms --fresh-installation
/home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/execjs-1.4.0/lib/execjs/runtimes.rb:51:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/execjs-1.4.0/lib/execjs.rb:5:in `<module:ExecJS>'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/execjs-1.4.0/lib/execjs.rb:4:in `<top (required)>'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `require'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `<top (required)>'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `require'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `<top (required)>'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1:in `require'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1:in `<top (required)>'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/bundler-1.2.1/lib/bundler/runtime.rb:68:in `require'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/bundler-1.2.1/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/bundler-1.2.1/lib/bundler/runtime.rb:66:in `each'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/bundler-1.2.1/lib/bundler/runtime.rb:66:in `block in require'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/bundler-1.2.1/lib/bundler/runtime.rb:55:in `each'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/bundler-1.2.1/lib/bundler/runtime.rb:55:in `require'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/bundler-1.2.1/lib/bundler.rb:128:in `require'
from /srv/samba/share/refinery2test/rickrockstar/config/application.rb:13:in `<top (required)>'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.2.8/lib/rails/commands.rb:24:in `require'
from /home/jharai/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.2.8/lib/rails/commands.rb:24:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
I've pasted the entire output on Gist because it was too long.
Strangely, I tried the same command some days before, and at that time everything worked fine.
Why does this happen? How can I solve it?

Answer 1

Maybe you could sudo apt-get install nodejs or see this post ExecJS and could not find a JavaScript runtime

Answer 2

To solve it I did:
Run refinerycms rickrockstar - it will fail with exception you described
Edit rickrockstar/Gemfile and uncomment *gem 'therubyracer', :platforms => :ruby* and save changes;
Run refinerycms rickrockstar again
Gemfile will have a conflict and ask if you want to override it. Answer no;
Override other files with conflicts
cd rickrockstar
rails s