ExecJS::RuntimeError in Users#index when doing second demo...

Hi all,

am working through Michael Hartl's tutorial and can't get past the
start of the second tutorial. i've tried everything i can think of at
this point, lots of googling etc.. no luck.. found a reference to the
problem on google and the execjs has been "fixed" for this bug but it
doesn't seem to fix it on my sys - i double checked the gem version
and i have the newest.. still no luck.

I'm using Windows XP, ruby 1.8.7, rails 3.1.0 and i also tried the new
rc1 version.. same problems...

here's the error:
ExecJS::RuntimeError in Users#index

Showing /home/max/rails_proj/demo_app/app/views/layouts/
application.html.erb where line #6 raised:

  (in /home/max/rails_proj/demo_app/app/assets/javascripts/
Extracted source (around line #6):

3: <head>
4: <title>DemoApp</title>
5: <%= stylesheet_link_tag "application" %>
6: <%= javascript_include_tag "application" %>
7: <%= csrf_meta_tags %>
8: </head>
9: <body>
Rails.root: /home/max/rails_proj/demo_app

Application Trace | Framework Trace | Full Trace
app/controllers/users_controller.rb:7:in `index'

thanks for any help...

I had the same problem, that I solved installing a java runtime in
sudo apt-get install nodejs

I follow this post:

To be clear, the problem is caused by the lack of javascript
runtime support NOT java. For a list of libraries see

An alternative to installing node.js is to simply add
gem "therubyracer"
to your Gemfile and run "bundle install" again.

PS - I've needed to add javascript support when installing
on both Ubuntu and Debian recently. Specifically, I get a
ExecJS::RuntimeUnavailable error when trying to
run "rails generate" or "rails server" on a newly
installed 3.1.1. ("rails new" runs without complaint.)
The fixes above get things rolling again.
Is there a known bug that I've missed somehow?

Dan Nachbar