我在尝试使用 rakefile 部署 Jekyll 站点时遇到了麻烦。按照此处的说明，我已经设置了 ssh 密钥，并且无需输入密码即可进入我的服务器，这样就可以了。但是，当我尝试运行测试同步（例如，rake deploy dry-run）时，我得到一个错误。我已将 rakefile.rb 添加到我的存储库中，但是当我尝试运行它时出现错误：
rake deploy:dryrun --trace
rake aborted!
Don't know how to build task 'deploy:dryrun'
/Users/Christopher/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/rake/task_manager.rb:49:in `[]'
/Users/Christopher/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/rake/application.rb:142:in `invoke_task'
/Users/Christopher/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/rake/application.rb:101:in `block (2 levels) in top_level'
/Users/Christopher/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/rake/application.rb:101:in `each'
/Users/Christopher/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/rake/application.rb:101:in `block in top_level'
/Users/Christopher/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/rake/application.rb:110:in `run_with_threads'
/Users/Christopher/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/rake/application.rb:95:in `top_level'
/Users/Christopher/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/rake/application.rb:73:in `block in run'
/Users/Christopher/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/rake/application.rb:160:in `standard_exception_handling'
/Users/Christopher/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/rake/application.rb:70:in `run'
/Users/Christopher/.rbenv/versions/2.0.0-p0/bin/rake:37:in `<main>'
关于我做错了什么的任何想法？