when I try to run my application i get this error message, i need help fixing the issue"autodetect': Could not find a JavaScript runtime"

C:\Sites\myrubyblog5>rails s C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/execjs-2.6.0/lib/execjs/run times.rb:48:in autodetect': Could not find a JavaScript runtime. See https://gi http://ift.tt/1VYImIZ for a list of available runtimes. (ExecJS::RuntimeUnavaila ble) from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/execjs-2.6.0/l ib/execjs.rb:5:in' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/execjs-2.6.0/l ib/execjs.rb:4:in <top (required)>' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/coffee-script- 2.4.1/lib/coffee_script.rb:1:inrequire' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/coffee-script- 2.4.1/lib/coffee_script.rb:1:in <top (required)>' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/coffee-script- 2.4.1/lib/coffee-script.rb:1:inrequire' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/coffee-script- 2.4.1/lib/coffee-script.rb:1:in <top (required)>' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/coffee-rails-4 .0.1/lib/coffee-rails.rb:1:inrequire' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/coffee-rails-4 .0.1/lib/coffee-rails.rb:1:in <top (required)>' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/ lib/bundler/runtime.rb:76:inrequire' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/ lib/bundler/runtime.rb:76:in block (2 levels) in require' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/ lib/bundler/runtime.rb:72:ineach' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/ lib/bundler/runtime.rb:72:in block in require' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/ lib/bundler/runtime.rb:61:ineach' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/ lib/bundler/runtime.rb:61:in require' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/ lib/bundler.rb:133:inrequire' from C:/Sites/myrubyblog5/config/application.rb:7:in <top (required)>' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8 /lib/rails/commands/commands_tasks.rb:79:inrequire' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8 /lib/rails/commands/commands_tasks.rb:79:in block in server' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8 /lib/rails/commands/commands_tasks.rb:76:intap' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8 /lib/rails/commands/commands_tasks.rb:76:in server' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8 /lib/rails/commands/commands_tasks.rb:40:inrun_command!' from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8 /lib/rails/commands.rb:17:in <top (required)>' from bin/rails:4:inrequire' from bin/rails:4:in `'

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