i believe you need a javascript engine to run your code...

try installing rubyracer as Jack said... I had a similar problem once and it
worked

2011/6/10 Jack Christensen <ja...@hylesanderson.edu>

> On 6/10/2011 10:05 AM, Zoloo wrote:
>
>> Hi guys,
>> When I trying to start server. I get following errors:
>>
>> user@user-desktop:~/todo$ rails s
>> /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/execjs-1.1.2/lib/
>> execjs/runtimes.rb:43:in `autodetect': Could not find a JavaScript
>> runtime. See https://github.com/sstephenson/execjs for a list of
>> available runtimes. (ExecJS::RuntimeUnavailable)
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> execjs-1.1.2/lib/execjs.rb:5:in `<module:ExecJS>'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> execjs-1.1.2/lib/execjs.rb:4:in `<top (required)>'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/coffee-
>> script-2.2.0/lib/coffee_script.rb:1:in `require'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/coffee-
>> script-2.2.0/lib/coffee_script.rb:1:in `<top (required)>'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/coffee-
>> script-2.2.0/lib/coffee-script.rb:1:in `require'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/coffee-
>> script-2.2.0/lib/coffee-script.rb:1:in `<top (required)>'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> actionpack-3.1.0.rc4/lib/sprockets/railtie.rb:6:in `require'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> actionpack-3.1.0.rc4/lib/sprockets/railtie.rb:6:in `using_coffee?'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> actionpack-3.1.0.rc4/lib/sprockets/railtie.rb:12:in `<class:Railtie>'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> actionpack-3.1.0.rc4/lib/sprockets/railtie.rb:4:in
>> `<module:Sprockets>'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> actionpack-3.1.0.rc4/lib/sprockets/railtie.rb:1:in `<top (required)>'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> actionpack-3.1.0.rc4/lib/action_controller/railtie.rb:7:in `require'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> actionpack-3.1.0.rc4/lib/action_controller/railtie.rb:7:in `<top
>> (required)>'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> activerecord-3.1.0.rc4/lib/active_record/railtie.rb:9:in `require'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> activerecord-3.1.0.rc4/lib/active_record/railtie.rb:9:in `<top
>> (required)>'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> railties-3.1.0.rc4/lib/rails/all.rb:11:in `require'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> railties-3.1.0.rc4/lib/rails/all.rb:11:in `block in<top (required)>'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> railties-3.1.0.rc4/lib/rails/all.rb:5:in `each'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> railties-3.1.0.rc4/lib/rails/all.rb:5:in `<top (required)>'
>>        from /home/user/apps/freekino/config/application.rb:3:in `require'
>>        from /home/user/apps/freekino/config/application.rb:3:in `<top
>> (required)>'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> railties-3.1.0.rc4/lib/rails/commands.rb:52:in `require'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> railties-3.1.0.rc4/lib/rails/commands.rb:52:in `block in<top
>> (required)>'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> railties-3.1.0.rc4/lib/rails/commands.rb:49:in `tap'
>>        from /home/user/.rvm/gems/ruby-1.9.2-p180@rails31rc4/gems/
>> railties-3.1.0.rc4/lib/rails/commands.rb:49:in `<top (required)>'
>>        from script/rails:6:in `require'
>>        from script/rails:6:in `<main>'
>>
>> Please help me!
>>
>>  Not sure if this is the best way going forward -- but to get you going
> now add the following line to your Gemfile and bundle install
>
> gem 'therubyracer'
>
> --
> Jack Christensen
> ja...@hylesanderson.edu
>
>
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-- 
Pedro Henrique de Souza Medeiros
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