ExecJS and could not find a JavaScript runtime

I'm trying to use the Mongoid / Devise Rails 3.1 template (Mongoid and Devise), and I keep getting an error stating ExecJS cannot find a JavaScript runtime. Fair enough when I didn't have any installed, but I've tried installing Node.js, Mustang and the Ruby Racer, but nothing is working. I could not find a JavaScript runtime. See sstephenson/ExecJS (GitHub) for a list of available runtimes (ExecJ

[yuya_lush]

gemのexecjsでエラーになったらtherubyracerを入れる。詳しくは解らんのだが、確かに動いた。w

[gelegele]

ubuntuでrails動かすのにnode.js入れた

[suginoy]

"bundle install --without assets"

[ngsw]

参考にした

[geekzshu]

raisl3.1 エラー変更