unicorn_rails -c config/unicorn.conf.rb -E production -D を実行するとエラーになる

 unicorn_rails -c config/unicorn.conf.rb -E production -D

/usr/local/bundle/gems/unicorn-5.4.1/lib/unicorn/configurator.rb:592:in `working_directory': config_file=config/unicorn.conf.rb would not be accessible in working_directory=/var/www/caleapp (ArgumentError)
master failed to start, check stderr log for details

  # set lets
  $worker  = 2
  $timeout = 30
  $app_dir = "/var/www/caleapp"
  $listen  = File.expand_path 'tmp/sockets/.unicorn.sock', $app_dir
  $pid     = File.expand_path 'tmp/pids/unicorn.pid', $app_dir
  $std_log = File.expand_path 'log/unicorn.log', $app_dir
  # set config
  worker_processes  $worker
  working_directory $app_dir
  stderr_path $std_log
  stdout_path $std_log
  timeout $timeout
  listen  $listen
  pid $pid
  # loading booster
  preload_app true
  # before starting processes
  before_fork do |server, worker|
    defined?(ActiveRecord::Base) and ActiveRecord::Base.connection.disconnect!
    old_pid = "#{server.config[:pid]}.oldbin"
    if old_pid != server.pid
      begin
        Process.kill "QUIT", File.read(old_pid).to_i
      rescue Errno::ENOENT, Errno::ESRCH
      end
    end
  end
  # after finishing processes
  after_fork do |server, worker|
    defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
  end
~                                                                                                                                                                       ~                           

bundle exec unicorn_rails -c config/unicorn.conf.rb -E production -D

[shota@ip-10-0-0-190 log]$ dir
development.log  nginx.access.log  nginx.error.log  production.log