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初めて新しいサーバーにRailsアプリケーションをデプロイする。 cap production deploy --traceを実行CapistranoでのRailsのデプロイ、未定義のメソッドnilのためのアップケース
は私に与える：
** Invoke production (first_time)
** Execute production
** Invoke load:defaults (first_time)
** Execute load:defaults
cap aborted!
NoMethodError: undefined method `upcase' for nil:NilClass
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/sshkit-1.14.0/lib/sshkit/configuration.rb:90:in `logger'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/sshkit-1.14.0/lib/sshkit/configuration.rb:51:in `output_verbosity='
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/capistrano-3.9.0/lib/capistrano/configuration.rb:94:in `block in configure_backend'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/sshkit-1.14.0/lib/sshkit.rb:11:in `configure'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/capistrano-3.9.0/lib/capistrano/configuration.rb:92:in `configure_backend'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/capistrano-3.9.0/lib/capistrano/setup.rb:32:in `block (2 levels) in <top (required)>'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task.rb:250:in `block in execute'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task.rb:250:in `each'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task.rb:250:in `execute'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task.rb:194:in `block in invoke_with_call_chain'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/2.4.0/monitor.rb:214:in `mon_synchronize'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task.rb:187:in `invoke_with_call_chain'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task.rb:180:in `invoke'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/application.rb:152:in `invoke_task'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/application.rb:108:in `block (2 levels) in top_level'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/application.rb:108:in `each'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/application.rb:108:in `block in top_level'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/application.rb:117:in `run_with_threads'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/application.rb:102:in `top_level'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/application.rb:80:in `block in run'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/application.rb:178:in `standard_exception_handling'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/application.rb:77:in `run'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/capistrano-3.9.0/lib/capistrano/application.rb:14:in `run'
/Users/dfaulken-af/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/capistrano-3.9.0/bin/cap:3:in `<top (required)>'
/Users/dfaulken-af/.rbenv/versions/2.4.1/bin/cap:22:in `load'
/Users/dfaulken-af/.rbenv/versions/2.4.1/bin/cap:22:in `<main>'
Tasks: TOP => production
を完全に宝石のコードに限定思われます。私がそれらの問題を開く前に（sshkit？）、誰もこれを見たことがありますか？
私はNet::SSH::Configを使用して、SSH設定ファイルからSSHユーザーを取得します。私はこれらの設定が正しいことを知っています。私はそれらを使ってサーバにログインできます。
remote_user = Net::SSH::Config.for('50.198.83.200')[:user] || ENV['USER']
server '50.198.83.200', user: remote_user, roles: %w(app db web)
しかし、私はUSER=the_user_name capとリモートユーザーなどを設定しようとしたし、まだ同じエラーを取得しました。