Rails server does not start?

Question

when i give the command "rails s" following error comes please help me! still i'm in rails project and then give this command

root@ubuntu:~# cd mon
root@ubuntu:~/mon# rails s
/usr/lib/ruby/gems/1.8/gems/execjs-1.3.0/lib/execjs/runtimes.rb:50:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
    from /usr/lib/ruby/gems/1.8/gems/execjs-1.3.0/lib/execjs.rb:5
    from /usr/lib/ruby/gems/1.8/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `require'
    from /usr/lib/ruby/gems/1.8/gems/coffee-script-2.2.0/lib/coffee_script.rb:1
    from /usr/lib/ruby/gems/1.8/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `require'
    from /usr/lib/ruby/gems/1.8/gems/coffee-script-2.2.0/lib/coffee-script.rb:1
    from /usr/lib/ruby/gems/1.8/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1:in `require'
    from /usr/lib/ruby/gems/1.8/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1
    from /usr/lib/ruby/gems/1.8/gems/bundler-1.1.3/lib/bundler/runtime.rb:68:in `require'
    from /usr/lib/ruby/gems/1.8/gems/bundler-1.1.3/lib/bundler/runtime.rb:68:in `require'
    from /usr/lib/ruby/gems/1.8/gems/bundler-1.1.3/lib/bundler/runtime.rb:66:in `each'
    from /usr/lib/ruby/gems/1.8/gems/bundler-1.1.3/lib/bundler/runtime.rb:66:in `require'
    from /usr/lib/ruby/gems/1.8/gems/bundler-1.1.3/lib/bundler/runtime.rb:55:in `each'
    from /usr/lib/ruby/gems/1.8/gems/bundler-1.1.3/lib/bundler/runtime.rb:55:in `require'
    from /usr/lib/ruby/gems/1.8/gems/bundler-1.1.3/lib/bundler.rb:119:in `require'
    from /root/mon/config/application.rb:7
    from /usr/lib/ruby/gems/1.8/gems/railties-3.2.3/lib/rails/commands.rb:53:in `require'
    from /usr/lib/ruby/gems/1.8/gems/railties-3.2.3/lib/rails/commands.rb:53
    from /usr/lib/ruby/gems/1.8/gems/railties-3.2.3/lib/rails/commands.rb:50:in `tap'
    from /usr/lib/ruby/gems/1.8/gems/railties-3.2.3/lib/rails/commands.rb:50
    from script/rails:6:in `require'
    from script/rails:6

score 11 · Accepted Answer · edited May 22 '22 at 19:43

11

add

gem 'therubyracer'

to your Gemfile and run

bundle

command The 'rails new' command creates a new Rails application with a default directory structure and configuration at the path you specify.

You can specify extra command-line arguments to be used every time
'rails new' runs in the .railsrc configuration file in your home directory,
or in $XDG_CONFIG_HOME/rails/railsrc if XDG_CONFIG_HOME is set.

Note that the arguments specified in the .railsrc file don't affect the
defaults values shown above in this help message.

edited May 22 '22 at 19:43

programing

3
2

answered Apr 07 '12 at 21:33

fl00r

82,987
33
217
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@ fl00r Hay thanks both of you guys it works... but every time creating a new project i have to add "gem therubyracer" into Gemfile, why is that ? – Gihan Dilusha Apr 08 '12 at 03:34

score 4 · Answer 2 · answered Apr 07 '12 at 20:18

4

You need to install a javascript runtime such as:

gem install therubyracer

or

http://nodejs.org/

This is used by the asset pipeline in rails 3 for compiling the coffeescript.

answered Apr 07 '12 at 20:18

DanS

17,550
9
53
47

i installed therubyracer gem but still same. – Gihan Dilusha Apr 08 '12 at 03:10
Did you add the new gem to your `Gemfile` and delete any `Gemfile.lock` file? – JellicleCat Jul 03 '12 at 15:32

Rails server does not start?

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