title: Rails Error: NoMethodError: undefined method `instance' for Capistrano::Configuration:Class Did you mean? instance_of?
body: <p>I'm trying to launch a rails application that has worked locally. When I run rails puma starts up correctly. </p>
  
  <p>The server is ubuntu is 16.04. Ruby is 2.3.1p112, rails is 6.0.1, nginx is 1.10.0, uniocrn is v5.2.0</p>
  
  <p>Nginx seems to be running. However when I try to connect on domainname.com I have a 502 error. </p>
  
  <p>When I run </p>
  
  <pre><code>bundle exec cap production deploy -T
  </code></pre>
  
  <p>I'm getting this traceback</p>
  
  <pre><code>root@ubuntu:/home/deployer/apps/appname/app# bundle exec cap production deploy --trace
  ** Invoke production (first_time)
  ** Execute production
  ** Invoke load:defaults (first_time)
  ** Execute load:defaults
  cap aborted!
  NoMethodError: undefined method `instance' for Capistrano::Configuration:Class
  Did you mean?  instance_of?
  /var/lib/gems/2.3.0/gems/bundler-1.14.3/lib/bundler/capistrano.rb:13:in `&lt;top (required)&gt;'
  config/deploy.rb:1:in `require'
  config/deploy.rb:1:in `&lt;top (required)&gt;'
  /var/lib/gems/2.3.0/gems/capistrano-3.2.1/lib/capistrano/setup.rb:14:in `load'
  /var/lib/gems/2.3.0/gems/capistrano-3.2.1/lib/capistrano/setup.rb:14:in `block (2 levels) in &lt;top (required)&gt;'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:250:in `block in execute'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:250:in `each'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:250:in `execute'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:194:in `block in invoke_with_call_chain'
  /usr/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:187:in `invoke_with_call_chain'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:180:in `invoke'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:152:in `invoke_task'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:108:in `block (2 levels) in top_level'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:108:in `each'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:108:in `block in top_level'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:117:in `run_with_threads'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:102:in `top_level'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:80:in `block in run'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:178:in `standard_exception_handling'
  /var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:77:in `run'
  /var/lib/gems/2.3.0/gems/capistrano-3.2.1/lib/capistrano/application.rb:15:in `run'
  /var/lib/gems/2.3.0/gems/capistrano-3.2.1/bin/cap:3:in `&lt;top (required)&gt;'
  /usr/local/bin/cap:23:in `load'
  /usr/local/bin/cap:23:in `&lt;top (required)&gt;'
  /var/lib/gems/2.3.0/gems/bundler-1.14.3/lib/bundler/cli/exec.rb:74:in `load'
  /var/lib/gems/2.3.0/gems/bundler-1.14.3/lib/bundler/cli/exec.rb:74:in `kernel_load'
  /var/lib/gems/2.3.0/gems/bundler-1.14.3/lib/bundler/cli/exec.rb:27:in `run'
  /var/lib/gems/2.3.0/gems/bundler-1.14.3/lib/bundler/cli.rb:335:in `exec'
  /var/lib/gems/2.3.0/gems/bundler-1.14.3/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
  /var/lib/gems/2.3.0/gems/bundler-1.14.3/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
  /var/lib/gems/2.3.0/gems/bundler-1.14.3/lib/bundler/vendor/thor/lib/thor.rb:359:in `dispatch'
  /var/lib/gems/2.3.0/gems/bundler-1.14.3/lib/bundler/cli.rb:20:in `dispatch'
  /var/lib/gems/2.3.0/gems/bundler-1.14.3/lib/bundler/vendor/thor/lib/thor/base.rb:440:in `start'
  /var/lib/gems/2.3.0/gems/bundler-1.14.3/lib/bundler/cli.rb:11:in `start'
  /var/lib/gems/2.3.0/gems/bundler-1.14.3/exe/bundle:32:in `block in &lt;top (required)&gt;'
  /var/lib/gems/2.3.0/gems/bundler-1.14.3/lib/bundler/friendly_errors.rb:121:in `with_friendly_errors'
  /var/lib/gems/2.3.0/gems/bundler-1.14.3/exe/bundle:24:in `&lt;top (required)&gt;'
  /usr/local/bin/bundle:23:in `load'
  /usr/local/bin/bundle:23:in `&lt;main&gt;'
  Tasks: TOP =&gt; production
  </code></pre>
  
  <p>Here is my config/deploy.rb</p>
  
  <pre><code>#set :repo_url, 'git@example.com:me/my_repo.git'
  
  # Default branch is :master
  # ask :branch, proc { `git rev-parse --abbrev-ref HEAD`.chomp }.call
  
  # Default deploy_to directory is /var/www/my_app
  # set :deploy_to, '/var/www/my_app'
  
  # Default value for :scm is :git
  # set :scm, :git
  
  # Default value for :format is :pretty
  # set :format, :pretty
  
  # Default value for :log_level is :debug
  # set :log_level, :debug
  
  # Default value for :pty is false
  # set :pty, true
  
  # Default value for :linked_files is []
  # set :linked_files, %w{config/database.yml}
  
  # Default value for linked_dirs is []
  # set :linked_dirs, %w{bin log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system}
  
  # Default value for default_env is {}
  # set :default_env, { path: "/opt/ruby/bin:$PATH" }
  
  # Default value for keep_releases is 5
  # set :keep_releases, 5
  
  namespace :deploy do
  
    desc 'Restart application'
    task :restart do
      on roles(:app), in: :sequence, wait: 5 do
        # Your restart mechanism here, for example:
        # execute :touch, release_path.join('tmp/restart.txt')
      end
    end
  
    after :publishing, :restart
  
    after :restart, :clear_cache do
      on roles(:web), in: :groups, limit: 3, wait: 10 do
        # Here we can do anything such as:
        # within release_path do
        #   execute :rake, 'cache:clear'
        # end
      end
    end
  
  end
  </code></pre>
  
  <p>Here is my config/deploy/production.rb</p>
  
  <pre><code>    # Simple Role Syntax
  # ==================
  # Supports bulk-adding hosts to roles, the primary server in each group
  # is considered to be the first unless any hosts have the primary
  # property set.  Don't declare `role :all`, it's a meta role.
  
  role :app, %w{deployer@appname.com}
  role :web, %w{deployer@appname.com}
  role :db,  %w{deployer@appname.com}
  
  
  # Extended Server Syntax
  # ======================
  # This can be used to drop a more detailed server definition into the
  # server list. The second argument is a, or duck-types, Hash and is
  # used to set extended properties on the server.
  
  server 'appname.com', user: 'deployer', roles: %w{web app}, my_property: :my_value
  
  
  # Custom SSH Options
  # ==================
  # You may pass any option but keep in mind that net/ssh understands a
  # limited set of options, consult[net/ssh documentation](http://net-ssh.github.io/net-ssh/classes/Net/SSH.html#method-c-start).
  #
  # Global options
  # --------------
  #  set :ssh_options, {
  #    keys: %w(/home/rlisowski/.ssh/id_rsa),
  #    forward_agent: false,
  #    auth_methods: %w(password)
  #  }
  #
  # And/or per server (overrides global)
  # ------------------------------------
  # server 'example.com',
  #   user: 'user_name',
  #   roles: %w{web app},
  #   ssh_options: {
  #     user: 'user_name', # overrides user setting above
  #     keys: %w(/home/user_name/.ssh/id_rsa),
  #     forward_agent: false,
  #     auth_methods: %w(publickey password)
  #     # password: 'please use keys'
  #   }
  </code></pre>
  
  <p>Here is my Capfile</p>
  
  <pre><code># Load DSL and Setup Up Stages
  require 'capistrano/setup'
  
  # Includes default deployment tasks
  require 'capistrano/deploy'
  
  # Includes tasks from other gems included in your Gemfile
  #
  # For documentation on these, see for example:
  #
  #   https://github.com/capistrano/rvm
  #   https://github.com/capistrano/rbenv
  #   https://github.com/capistrano/chruby
  #   https://github.com/capistrano/bundler
  #   https://github.com/capistrano/rails
  #
  # require 'capistrano/rvm'
  # require 'capistrano/rbenv'
  # require 'capistrano/chruby'
  # require 'capistrano/bundler'
  # require 'capistrano/rails/assets'
  # require 'capistrano/rails/migrations'
  
  # Loads custom tasks from `lib/capistrano/tasks' if you have any defined.
  Dir.glob('lib/capistrano/tasks/*.rake').each { |r| import r }
  </code></pre>
  
  <p>I tried downgrading/upgrading my capfile. It seems that everyone </p>