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Asked: 2026-05-31T18:12:46+00:00

Copied from my log file ActionView::Template::Error (Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs

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Copied from my log file

ActionView::Template::Error (Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes.

I’m not planning on using execjs as a runtime for my application. How can I avoid this problem?

In my Gemfile I commented the following two lines out, but I had no effect:

# gem 'sass-rails',   '~> 3.2.3'
# gem 'coffee-rails', '~> 3.2.1'
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1 Answer

  1. Editorial Team

    I had this same problem after a six month hiatus from using Heroku.
    It turned out I needed to use the ‘cedar’ stack and change the deployment URL to use the new installation.
    In my app directory:

    heroku create --stack cedar
git remote set-url heroku git@heroku.com:blooming-river-1759.git
git push heroku master

    http://dsimard.posterous.com/assets-problems-with-heroku-and-rails-31

    http://devcenter.heroku.com/articles/cedar

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