Rails 4, Capistrano 3.0.0, cannot load such file -- deploy
I had to gem uninstall capistrano and selected version 3.0.0
(i.e. downgraded the gem to 2.x)
I had to run
gem uninstall capistrano
then update the gemfile with
gem 'capistrano', '~> 2.15'
and then run to reinstall the correct version again with
bundle update capistrano
Make sure you are using bundle exec (most likely you have multiple gem versions of capistrano)
i.e.
bundle exec cap -T