ruby on railsのローカルサーバーが建てられません

Question

前提・実現したいこと

昨日ruby on railsを触り始めた超初心者です。

ruby on railsのローカルサーバーを建てたいです。

前提として

macを使用しています
ターミナルを使用しています

下記をインストールしています
ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-darwin19]
Homebrew 2.3.0
rbenv 1.1.2
Rails 5.2.4.3

sample_appというフォルダを作成しています

railsのローカルサーバーを建てようと『rails s』を入力したのですが
下記のように表示されてサーバーが建てられていない状態です。

発生している問題・エラーメッセージ

ishiwatahiroshishou@MacBook-Pro sample_app % rails s
Traceback (most recent call last):
61: from bin/rails:3:in <main>' 60: from bin/rails:3:in load'
59: from /Users/ishiwatahiroshishou/sample_app/bin/spring:15:in <top (required)>' 58: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:72:in require'
57: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:72:in require' 56: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/site_ruby/2.6.0/bundler/runtime.rb:58:in each'

----------------------------------文字数の都合で中略--------------------------------

19: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/site_ruby/2.6.0/bundler/runtime.rb:69:in `block in require'
18: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/site_ruby/2.6.0/bundler/runtime.rb:69:in `each'
17: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/site_ruby/2.6.0/bundler/runtime.rb:74:in `block (2 levels) in require'
16: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
15: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
14: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
13: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
12: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
11: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/uglifier-4.2.0/lib/uglifier.rb:5:in `<main>'
10: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in `require'
 9: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:257:in `load_dependency'
 8: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in `block in require'
 7: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
 6: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
 5: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
 4: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
 3: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
 2: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/execjs-2.7.0/lib/execjs.rb:4:in `<main>'
 1: from /Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/execjs-2.7.0/lib/execjs.rb:5:in `<module:ExecJS>'

/Users/ishiwatahiroshishou/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/execjs-2.7.0/lib/execjs/runtimes.rb:58:in `autodetect': Could not find a JavaScript runtime. See https://github.com/rails/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
ishiwatahiroshishou@MacBook-Pro sample_app % ruby -v

試したこと

gemをインストールしましたgem install bundler:1.17.2
gemファイル内には下記の様に入力しています

frozen_string_literal: ture
source "https://rubygems.org"
git_source(:github) {|repo_name| "http://github.com/#{repo_name}" }
gem "rails"
gem "sass"
~

"~/Gemfile" 8L, 156C

上記をインストールした上で『rails s』をしても結果は同じでした。

恐れ入りますが有識者の方々お力を貸していただけませんでしょうか。
何卒よろしくお願いいたします。

Answer 1

 Could not find a JavaScript runtime. See https://github.com/rails/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)

エラーメッセージの最下部に思いっきり原因が書いてあります。

Comments

[sunshi]

maisumakun様ご回答ありがとうござます。
この場合どの様な対処をすればよろしいでしょうか。
差し支えなければご回答お願いいたします。

[sunshi]

maisumakun様ありがとうございました！
サーバーを立てる事ができました！