unicornが起動できない

rails で作成したアプリをheroku からaws へ移行しようと試みているのですが、unicornの起動がうまくいかずエラーが出ます。

unicorn.log 

INFO -- : Refreshing Gem list
/home/user/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/bullet-6.0.2/lib/bullet.rb:41: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/home/user/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activesupport-6.0.1/lib/active_support/core_ext/module/delegation.rb:171: warning: The called method `delegate' is defined here
/home/user/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/tzinfo-1.2.5/lib/tzinfo/ruby_core_support.rb:142: warning: Using the last argument as keyword parameters is deprecated
/home/user/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/tzinfo-1.2.5/lib/tzinfo/ruby_core_support.rb:142: warning: Using the last argument as keyword parameters is deprecated
/home/user/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/actionpack-6.0.1/lib/action_dispatch/middleware/stack.rb:37: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/home/user/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/actionpack-6.0.1/lib/action_dispatch/middleware/ssl.rb:59: warning: The called method `initialize' is defined here
/home/user/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activerecord-6.0.1/lib/active_record/store.rb:106: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/home/user/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activerecord-6.0.1/lib/active_record/store.rb:109: warning: The called method `store_accessor' is defined here
bundler: failed to load command: unicorn_rails (/home/user/.rbenv/versions/2.7.0/bin/unicorn_rails)
Aws::Sigv4::Errors::MissingCredentialsError: Cannot load `Rails.config.active_storage.service`:
missing credentials, provide credentials with one of the following options:
  - :access_key_id and :secret_access_key
  - :credentials
  - :credentials_provider

maybe ** should be added to the call　というエラーはコマンドを打つときに追加すれば良いのでしょうか。
Aws::Sigv4::Errors::MissingCredentialsError:　の部分はawsS3に関するエラーかと思うのですが、herokuでデプロイしている段階では機能していたのですが。。。

unicornの設定ファイル

# set lets
$worker  = 2
$timeout = 30
$app_dir = "/var/www/rails/hoge_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 finishing processes
after_fork do |server, worker|
  defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
end

nginxの設定ファイル

# log directory
error_log  /var/www/rails/hoge_app/log/nginx.error.log; 
access_log /var/www/rails/hoge_app/log/nginx.access.log; 
# max body size
client_max_body_size 2G;
upstream app_server {
  # for UNIX domain socket setups
  server unix:/var/www/rails/hoge_app/tmp/sockets/.unicorn.sock fail_timeout=0; 
}
server {
  listen 80;
  server_name ~~~.~~~.~~~.~~~;#アプリのElastic IP
  # nginx so increasing this is generally safe...
  keepalive_timeout 5;
  # path for static files
  root /var/www/rails/hoge_app/public; 
  # page cache loading
  try_files $uri/index.html $uri.html $uri @app;
  location @app {
    # HTTP headers
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://app_server;
  }
  # Rails error pages
  error_page 500 502 503 504 /500.html;
  location = /500.html {
    root /var/www/rails/hoge_app/public;
  }
}

原因が分かる方いらっしゃいませんか？