installing ruby on rails 1.9.3 on windows 7

m sorry its a totally newbie question, but m really stuck. please help
if possible.
after installing everything required to run ruby on rails when i write
the command 'rails s' in the command prompt it doesn't start the server.
rather it shows :

C:\Sites\railsinstaller_demo>rails s
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/execjs-1.4.0/lib/execjs/run
times.rb:51:in `autodetect': Could not find a JavaScript runtime. See
https://gi
thub.com/sstephenson/execjs for a list of available runtimes.
(ExecJS::RuntimeUn
available)
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/execjs-1.4.0/l
ib/execjs.rb:5:in `<module:ExecJS>'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/execjs-1.4.0/l
ib/execjs.rb:4:in `<top (required)>'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/coffee-script-
2.2.0/lib/coffee_script.rb:1:in `require'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/coffee-script-
2.2.0/lib/coffee_script.rb:1:in `<top (required)>'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/coffee-script-
2.2.0/lib/coffee-script.rb:1:in `require'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/coffee-script-
2.2.0/lib/coffee-script.rb:1:in `<top (required)>'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/coffee-rails-3
.2.2/lib/coffee-rails.rb:1:in `require'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/coffee-rails-3
.2.2/lib/coffee-rails.rb:1:in `<top (required)>'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22
/lib/bundler/runtime.rb:68:in `require'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22
/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22
/lib/bundler/runtime.rb:66:in `each'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22
/lib/bundler/runtime.rb:66:in `block in require'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22
/lib/bundler/runtime.rb:55:in `each'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22
/lib/bundler/runtime.rb:55:in `require'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/bundler-1.0.22
/lib/bundler.rb:122:in `require'
        from C:/Sites/railsinstaller_demo/config/application.rb:7:in
`<top (requ
ired)>'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
/lib/rails/commands.rb:53:in `require'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
/lib/rails/commands.rb:53:in `block in <top (required)>'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
/lib/rails/commands.rb:50:in `tap'
        from
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.1
/lib/rails/commands.rb:50:in `<top (required)>'
        from script/rails:6:in `require'
        from script/rails:6:in `<main>'

Please guide me what to do..
thanks..

You should take a look at this

C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/execjs-1.4.0/lib/execjs/run
times.rb:51:in `autodetect’: Could not find a JavaScript runtime. See

https://github.com/sstephenson/execjs for a list of available runtimes.
(ExecJS::RuntimeUnavailable)

Its always useful to look the errors, I’ve seen this problem before you have to add therubyracer gem to you Gemfile (or take a look at the given link)

Javier Q

Install a javascript runtime?

Correct link

https://github.com/sstephenson/execjs

did everything.
used the rubyracer and copied the source in my gemfile. ran the bundle
install again but no use.

maybe i'm doing the process of adding the rubyracer wrong.
i would be very thankful if you please guide me through the process.
thanks.

Post your Gemfile here.

Colin

this is the gemfile without the source of the ruby racer added.

thanks for the help.

Attachments:
http://www.ruby-forum.com/attachment/7481/Gemfile

Please quote the previous reply so we know what you are talking about
without having to go back over previous posts to find the context.
Remember this is a mailing list (though you may be posting via a
forum).

There is no point posting it without ruby racer as that is the one you
need to get working. Also post the output from bundle install
Just post it inline, we don't want to mess about downloading files.

Colin

therubyracer does not work on Windows due it’s dependency on libv8.

Windows already provides a JavaScript engine, but sometimes it might be missing from your system.

You can simply install Node.JS and restart your computer to ensure “node” executable is available in the command prompt.

Then try your Rails application again.

Luis Lavena wrote in post #1064505:

My hero too!!!
=)