ruby on rails - error while running rake about command -


i installed of ruby on rails on linux system..and when type command 'rake about' following error..plz 

   rake aborted!    not find javascript runtime. see https://github.com/sstephenson/execjs                   list of available runtimes.    /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/execjs-1.4.0/lib/execjs/runtimes.rb:51:in `autodetect'    /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/execjs-1.4.0/lib/execjs.rb:5    /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `require'    /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/coffee-script-2.2.0/lib/coffee_script.rb:1    /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `require'    /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/coffee-script-2.2.0/lib/coffee-    script.rb:1    /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/coffee-rails-3.2.2/lib/coffee-  rails.rb:1:in `require'    /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/coffee-rails-3.2.2/lib/coffee-  rails.rb:1    /home/imobigeeks1/work/demo/config/application.rb:7    /home/imobigeeks1/work/demo/rakefile:5    (see full trace running task --trace)

and installed javascript using gem install execjs command still showing same problem

put gem 'therubyracer' in gemfile , bundle install command line.

this gem for-

call javascript code , manipulate javascript objects ruby. call ruby code , manipulate ruby objects javascript.

source - http://rubydoc.info/gems/therubyracer/0.11.4/frames


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