Try running 'bundle install' (or 'bundle' for short) from the command line and then repushing to Heroku. If that doesn't work, try 'bundle update'.
Make sure you run bundle install anytime after changing your Gemfile. ============ About Gemfile.lock: If you have gem 'rails' in your Gemfile, when you run 'bundle install' for the first time, Bundler will create your Gemfile.lock file to specify the version of the gems that you're using (along with the gems that your gems depend on). rails (3.0.3) Typically, when you add or remove a gem, 'bundle install' will update your Gemfile.lock file without a problem. However, when you get to working with different gem versions then you may need 'bundle update'. Be careful with this though, 'bundle update' without specifying a gem will update ALL of your gems. So if a gem has a major version out that your weren't aware of, your application may break. Please read http://gembundler.com/man/bundle-update.1.html -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com. To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.