I am trying to do \"rake db:migrate\" and it is giving me this error.
Andy:AcademyAir Andy$ rake db:migrate /Users/Andy/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.
Solved the same issue by running:
bundle update
This will update your rake gem to the latest version and allow you to run the migration.
If you are using a gemset: be sure to run bundle install after you've updated rake to update your local gemset as well.
bundle install