我正在按照本教程使用nginx，Passenger和capistrano在VPS（DigitalOcean）上部署我的RoR 4应用程序：
http://gorails.com/deploy/ubuntu/12.04
但是当我运行'cap production deploy'时，我收到以下错误：
..
..
** Invoke rvm:hook (first_time)
** Execute rvm:hook
DEBUG [971a1192] Running /usr/bin/env [ -d ~/.rvm ] on 188.226.143.213
DEBUG [971a1192] Command: [ -d ~/.rvm ]
cap aborted!
deploy
/home/deploy/.rvm/gems/ruby-2.0.0-p353/gems/net-ssh-2.7.0/lib/net/ssh.rb:215:in `start'
/home/deploy/.rvm/gems/ruby-2.0.0-p353/gems/sshkit-1.3.0/lib/sshkit/backends/connection_pool.rb:25:in `create_or_reuse_connection'
/home/deploy/.rvm/gems/ruby-2.0.0-p353/gems/sshkit-1.3.0/lib/sshkit/backends/netssh.rb:173:in `ssh'
/home/deploy/.rvm/gems/ruby-2.0.0-p353/gems/sshkit-1.3.0/lib/sshkit/backends/netssh.rb:126:in `block in _execute'
/home/deploy/.rvm/gems/ruby-2.0.0-p353/gems/sshkit-1.3.0/lib/sshkit/backends/netssh.rb:123:in `tap'
/home/deploy/.rvm/gems/ruby-2.0.0-p353/gems/sshkit-1.3.0/lib/sshkit/backends/netssh.rb:123:in `_execute'
/home/deploy/.rvm/gems/ruby-2.0.0-p353/gems/sshkit-1.3.0/lib/sshkit/backends/netssh.rb:62:in `test'
/home/deploy/.rvm/gems/ruby-2.0.0-p353/gems/capistrano-rvm-0.1.1/lib/capistrano/tasks/rvm.rake:19:in `block (3 levels) in <top (required)>'
/home/deploy/.rvm/gems/ruby-2.0.0-p353/gems/sshkit-1.3.0/lib/sshkit/backends/netssh.rb:54:in `instance_exec'
/home/deploy/.rvm/gems/ruby-2.0.0-p353/gems/sshkit-1.3.0/lib/sshkit/backends/netssh.rb:54:in `run'
/home/deploy/.rvm/gems/ruby-2.0.0-p353/gems/sshkit-1.3.0/lib/sshkit/runners/parallel.rb:12:in `block (2 levels) in execute'
Tasks: TOP => rvm:hook
我一直试图将错误修复几个小时，没有运气。 似乎无法在网上找到类似的东西。
任何帮助将不胜感激，
乌卢格别克