How to fix the uninitialized constant Rake::DSL problem on Heroku?

I am getting errors similar to the ones in these questions, except mine are occuring on Heroku: 2011-05-30T09:03:29+00:00 heroku[worker.1]: Starting process with command: `rake jobs:work` 2011-05-30T09:03:30+00:00 app[worker.1]: (in /app) 2011-05-30T09:03:30+00:00 heroku[worker.1]: State changed from starting to up 2011-05-30T09:03:33+00:00 app[worker.1]: rake aborted! 2011-05-30T09:03:33+00:00 app[worker.1]: uninitialized constant Rake::DSL 2011-05-30T09:03:33+00:00 app[worker.1]: /app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.0/lib/rake/tasklib.rb:8:in `<class:TaskLib>’ The answer in those questions […]

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