unicornが起動しない

前提・実現したいこと

VPS(Conoha)を使用して、railsのアプリをデプロイしたいです。
unicornの起動(bundle exec rake unicorn:start)をすると以下のような
メッセージが出現します。

発生している問題・エラーメッセージ

bundle exec unicorn_rails -c /Users/naotomatsunaga/App/Portfolio/config/unicorn.rb -E production -D
bundler: failed to load command: unicorn_rails (/Users/naotomatsunaga/.rbenv/versions/3.0.0/bin/unicorn_rails)
/Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/unicorn-6.0.0/lib/unicorn/configurator.rb:85:in `read': No such file or directory @ rb_sysopen - /Users/naotomatsunaga/App/Portfolio/config/unicorn.rb (Errno::ENOENT)
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/unicorn-6.0.0/lib/unicorn/configurator.rb:85:in `reload'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/unicorn-6.0.0/lib/unicorn/configurator.rb:78:in `initialize'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/unicorn-6.0.0/lib/unicorn/http_server.rb:78:in `new'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/unicorn-6.0.0/lib/unicorn/http_server.rb:78:in `initialize'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/unicorn-6.0.0/bin/unicorn_rails:209:in `new'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/unicorn-6.0.0/bin/unicorn_rails:209:in `<top (required)>'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/bin/unicorn_rails:23:in `load'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/bin/unicorn_rails:23:in `<top (required)>'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/lib/bundler/cli/exec.rb:63:in `load'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/lib/bundler/cli/exec.rb:63:in `kernel_load'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/lib/bundler/cli/exec.rb:28:in `run'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/lib/bundler/cli.rb:497:in `exec'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/lib/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/lib/bundler/vendor/thor/lib/thor.rb:392:in `dispatch'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/lib/bundler/cli.rb:30:in `dispatch'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/lib/bundler/vendor/thor/lib/thor/base.rb:485:in `start'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/lib/bundler/cli.rb:24:in `start'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/exe/bundle:49:in `block in <top (required)>'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/lib/bundler/friendly_errors.rb:130:in `with_friendly_errors'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/bundler-2.2.3/exe/bundle:37:in `<top (required)>'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/bin/bundle:23:in `load'
	from /Users/naotomatsunaga/.rbenv/versions/3.0.0/bin/bundle:23:in `<main>'
master failed to start, check stderr log for details
rake aborted!
Command failed with status (1): [bundle exec unicorn_rails -c /Users/naotom...]
/Users/naotomatsunaga/App/Portfolio/lib/tasks/unicorn.rake:8:in `block (2 levels) in <main>'
/Users/naotomatsunaga/.rbenv/versions/3.0.0/bin/bundle:23:in `load'
/Users/naotomatsunaga/.rbenv/versions/3.0.0/bin/bundle:23:in `<main>'
Tasks: TOP => unicorn:start
(See full trace by running task with --trace)

unicorn.rb

worker_processes Integer(ENV["WEB_CONCURRENCY"] || 3)
timeout 15
preload_app true

# Unicornのsock、pidファイルのパスを指定
listen "/home/App/Portfolio/tmp/unicorn.sock"
pid "/home/App/Portfolio/tmp/unicorn.pid"

before_fork do |server, worker|
  Signal.trap 'TERM' do
    puts 'Unicorn master intercepting TERM and sending myself QUIT  instead'
    Process.kill 'QUIT', Process.pid
  end

  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.connection.disconnect!
end

after_fork do |server, worker|
  Signal.trap 'TERM' do
    puts 'Unicorn worker intercepting TERM and doing nothing. Wait for master to send QUIT' 
  end

  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.establish_connection
end

# Unicornのログのパスを指定
stderr_path File.expand_path('log/unicorn.log', ENV['RAILS_ROOT'])
stdout_path File.expand_path('log/unicorn.log', ENV['RAILS_ROOT'])