I tried installing dashing again this time with the following configuration
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linux (cent 6.4)
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RVM
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ruby 2.1.1
ruby --version ruby 2.1.1p76 (2014-02-24 revision 45161) [x86_64-linux]
dashing start
/home/vagrant/.rvm/gems/ruby-2.1.1/gems/execjs-2.0.2/lib/execjs/runtimes.rb:51:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/execjs-2.0.2/lib/execjs.rb:5:in `<module:ExecJS>'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/execjs-2.0.2/lib/execjs.rb:4:in `<top (required)>'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/backports-3.6.0/lib/backports/tools.rb:343:in `require'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/backports-3.6.0/lib/backports/tools.rb:343:in `require_with_backports'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `<top (required)>'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/backports-3.6.0/lib/backports/tools.rb:343:in `require'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/backports-3.6.0/lib/backports/tools.rb:343:in `require_with_backports'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `<top (required)>'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/backports-3.6.0/lib/backports/tools.rb:343:in `require'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/backports-3.6.0/lib/backports/tools.rb:343:in `require_with_backports'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/dashing-1.3.4/lib/dashing/app.rb:5:in `<top (required)>'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/dashing-1.3.4/lib/dashing.rb:3:in `require'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/dashing-1.3.4/lib/dashing.rb:3:in `<top (required)>'
from config.ru:1:in `require'
from config.ru:1:in `block in <main>'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/rack-1.5.2/lib/rack/builder.rb:55:in `instance_eval'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/rack-1.5.2/lib/rack/builder.rb:55:in `initialize'
from config.ru:1:in `new'
from config.ru:1:in `<main>'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/thin-1.6.2/lib/rack/adapter/loader.rb:33:in `eval'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/thin-1.6.2/lib/rack/adapter/loader.rb:33:in `load'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/thin-1.6.2/lib/thin/controllers/controller.rb:182:in `load_rackup_config'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/thin-1.6.2/lib/thin/controllers/controller.rb:72:in `start'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/thin-1.6.2/lib/thin/runner.rb:199:in `run_command'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/thin-1.6.2/lib/thin/runner.rb:155:in `run!'
from /home/vagrant/.rvm/gems/ruby-2.1.1/gems/thin-1.6.2/bin/thin:6:in `<top (required)>'
from /home/vagrant/.rvm/gems/ruby-2.1.1/bin/thin:23:in `load'
from /home/vagrant/.rvm/gems/ruby-2.1.1/bin/thin:23:in `<main>'
from /home/vagrant/.rvm/gems/ruby-2.1.1/bin/ruby_executable_hooks:15:in `eval'
from /home/vagrant/.rvm/gems/ruby-2.1.1/bin/ruby_executable_hooks:15:in `<main>'
Fixed by following this page
http://stackoverflow.com/questions/9202324/execjs-could-not-find-a-javascript-runtime-but-execjs-and-therubyracer-are-in
yum install nodejs