こんなエラーが発生しまして。
E, [2015-01-07T01:46:36.842850 #2619] ERROR -- : undefined method `set' for main:Object (NoMethodError)
/Users/okitsu.takatomo/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/capistrano-rsync-1.0.2/lib/capistrano/rsync.rb:8:in `<top (required)>'
/Users/okitsu.takatomo/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/bundler-1.7.11/lib/bundler/runtime.rb:85:in `require'
/Users/okitsu.takatomo/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/bundler-1.7.11/lib/bundler/runtime.rb:85:in `rescue in block in require'
/Users/okitsu.takatomo/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/bundler-1.7.11/lib/bundler/runtime.rb:68:in `block in require'
/Users/okitsu.takatomo/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/bundler-1.7.11/lib/bundler/runtime.rb:61:in `each'
/Users/okitsu.takatomo/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/bundler-1.7.11/lib/bundler/runtime.rb:61:in `require'
/Users/okitsu.takatomo/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/bundler-1.7.11/lib/bundler.rb:134:in `require'
/Users/okitsu.takatomo/Documents/workspace/app_server/config/application.rb:7:in `<top (required)>'
/Users/okitsu.takatomo/Documents/workspace/app_server/config/environment.rb:2:in `require'
/Users/okitsu.takatomo/Documents/workspace/app_server/config/environment.rb:2:in `<top (required)>'
config.ru:4:in `require'
config.ru:4:in `block in <main>'
以下で解決 (require: falseの付与)
gem 'capistrano'
gem 'capistrano-rails', require: false
gem 'capistrano-rsync', require: false
gem 'capistrano-rbenv', require: false
gem 'capistrano-bundler', require: false
gem 'capistrano3-unicorn', require: false