AWSにデプロイ時にUnicornが起動しない

お世話になっております。
下記の問題について知見がある方がいらっしゃいましたらご教示お願いします。

#起きている問題

$ bundle exec unicorn_rails -c /var/www/rails/coffee_app/config/unicorn.conf.rb -D -E production
bundler: failed to load command: unicorn_rails (/home/ryouya/.rbenv/versions/2.5.1/bin/unicorn_rails)
SyntaxError: /var/www/rails/coffee_app/config/unicorn.conf.rb:29: syntax error, unexpected keyword_end, expecting end-of-input
  end
  ^~~
  /home/ryouya/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/unicorn-
:
(省略)
:
  /home/ryouya/.rbenv/versions/2.5.1/bin/unicorn_rails:23:in `<top (required)>'
master failed to start, check stderr log for details

AWS上のUnicornが起動しません。

SyntaxError: /var/www/rails/coffee_app/config/unicorn.conf.rb:29: syntax error, unexpected keyword_end, expecting end-of-input

エラー文としてはunicorn.conf.rbでendが多いという指摘をもらっているのですが、
endの数は合っている認識です。

####unicorn.conf.rb

  $worker  = 2
  $timeout = 30
  $app_dir = "/var/www/rails/coffee_app”
  $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_fork do |server, worker|
    defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
  end

#試したこと
###endを１つ無くす
別のエラーが発生しました。

$ bundle exec unicorn_rails -c /var/www/rails/coffee_app/config/unicorn.conf.rb -D -E production
bundler: failed to load command: unicorn_rails (/home/ryouya/.rbenv/versions/2.5.1/bin/unicorn_rails)
NameError: undefined local variable or method `old_pid' for #<Unicorn::Configurator:0x000000000164f540>
  /var/www/rails/coffee_app/config/unicorn.conf.rb:23:in `reload'
:
(省略)
:
  /home/ryouya/.rbenv/versions/2.5.1/bin/unicorn_rails:23:in `<top (required)>'
master failed to start, check stderr log for details

###EC2を再起動
問題解決にはなりませんでした。

#関連ファイル
####unicorn.conf.rb

$worker  = 2
  $timeout = 30
  $app_dir = "/var/www/rails/coffee_app”
  $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_fork do |server, worker|
    defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
  end

#環境
ruby 2.5.1
rails 5.1.6