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I am having trouble deploying a rails 3.1 beta project to heroku. The problem happened at the database migration step. When I ran: heroku rake db:migrate I got error message: > rake aborted! > Could not find a JavaScript runtime. See > https://github.com/sstephenson/execjs > for a list of available runtimes. > /app/Rakefile:5 > (See full trace by running task with --trace) > (in /app) But I can successfully run the application locally, and I do have nodejs installed. Any idea why? Here my gem list: abstract (1.0.0) actionmailer (3.1.0.beta1) actionpack (3.1.0.beta1, 3.0.7) activemodel (3.1.0.beta1, 3.0.7) activerecord (3.1.0.beta1) activeresource (3.1.0.beta1) activesupport (3.1.0.beta1, 3.0.7) ansi (1.2.5) arel (2.1.0) bcrypt-ruby (2.1.4) builder (3.0.0, 2.1.2) bundler (1.0.13) coffee-script (2.2.0) coffee-script-source (1.1.0) configuration (1.2.0) daemon_controller (0.2.6) erubis (2.7.0, 2.6.6) execjs (1.0.0, 0.3.3) fastthread (1.0.7) heroku (2.1.4) hike (1.0.0) i18n (0.6.0beta1, 0.5.0) jquery-rails (1.0.1) json (1.5.1) json_pure (1.5.1) launchy (0.4.0) mail (2.3.0) mime-types (1.16) minitest (1.6.0) multi_json (1.0.1) mysql (2.8.1) mysql2 (0.3.2) oauth (0.4.4) passenger (3.0.7) polyglot (0.3.1) rack (1.3.0.beta, 1.2.2) rack-cache (1.0.1) rack-mount (0.7.2, 0.6.14) rack-ssl (1.3.2) rack-test (0.6.0, 0.5.7) rails (3.1.0.beta1) railties (3.1.0.beta1) rake (0.8.7) rdoc (2.5.8) rest-client (1.6.1) rubygems-update (1.8.1) sass (3.1.1) simplegeo (0.5.1) sprockets (2.0.0.beta.2) sqlite3 (1.3.3) sqlite3-ruby (1.3.3) term-ansicolor (1.0.5) therubyracer-heroku (0.8.1.pre3) thor (0.14.6) tilt (1.3) treetop (1.4.9) turn (0.8.2) tzinfo (0.3.27) uglifier (0.5.1)

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