railsのローカルサーバーが建てられない。rails s

前提・実現したいこと

rails のローカルサーバーを建てたいです。
初心者で試行錯誤していますがエラーがでてしましいます。

発生している問題・エラーメッセージ

ExecJS::RuntimeUnavailable

該当のソースコード

rails s
Traceback (most recent call last):
61: from bin/rails:3:in <main>' 60: from bin/rails:3:in load'
59: from /Users/r/untitled folder/test_app/bin/spring:15:in <top (required)>' 58: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in require'
57: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in require' 56: from /Library/Ruby/Gems/2.6.0/gems/spring-2.1.0/lib/spring/binstub.rb:11:in <top (required)>'
55: from /Library/Ruby/Gems/2.6.0/gems/spring-2.1.0/lib/spring/binstub.rb:11:in load' 54: from /Library/Ruby/Gems/2.6.0/gems/spring-2.1.0/bin/spring:49:in <top (required)>'
53: from /Library/Ruby/Gems/2.6.0/gems/spring-2.1.0/lib/spring/client.rb:30:in run' 52: from /Library/Ruby/Gems/2.6.0/gems/spring-2.1.0/lib/spring/client/command.rb:7:in call'
51: from /Library/Ruby/Gems/2.6.0/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in call' 50: from /Library/Ruby/Gems/2.6.0/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in load'
49: from /Users/r/untitled folder/test_app/bin/rails:9:in <top (required)>' 48: from /Library/Ruby/Gems/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in require'
47: from /Library/Ruby/Gems/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:257:in load_dependency' 46: from /Library/Ruby/Gems/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in block in require'
45: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in require' 44: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in require_with_bootsnap_lfi'
43: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in register' 42: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in block in require_with_bootsnap_lfi'
41: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in require' 40: from /Library/Ruby/Gems/2.6.0/gems/railties-5.2.4.3/lib/rails/commands.rb:18:in <main>'
39: from /Library/Ruby/Gems/2.6.0/gems/railties-5.2.4.3/lib/rails/command.rb:46:in invoke' 38: from /Library/Ruby/Gems/2.6.0/gems/railties-5.2.4.3/lib/rails/command/base.rb:69:in perform'
37: from /Library/Ruby/Gems/2.6.0/gems/thor-1.0.1/lib/thor.rb:392:in dispatch' 36: from /Library/Ruby/Gems/2.6.0/gems/thor-1.0.1/lib/thor/invocation.rb:127:in invoke_command'
35: from /Library/Ruby/Gems/2.6.0/gems/thor-1.0.1/lib/thor/command.rb:27:in run' 34: from /Library/Ruby/Gems/2.6.0/gems/railties-5.2.4.3/lib/rails/commands/server/server_command.rb:142:in perform'
33: from /Library/Ruby/Gems/2.6.0/gems/railties-5.2.4.3/lib/rails/commands/server/server_command.rb:142:in tap' 32: from /Library/Ruby/Gems/2.6.0/gems/railties-5.2.4.3/lib/rails/commands/server/server_command.rb:145:in block in perform'
31: from /Library/Ruby/Gems/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in require' 30: from /Library/Ruby/Gems/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:257:in load_dependency'
29: from /Library/Ruby/Gems/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in block in require' 28: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in require'
27: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in require_with_bootsnap_lfi' 26: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in register'
25: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in block in require_with_bootsnap_lfi' 24: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in require'
23: from /Users/r/untitled folder/test_app/config/application.rb:7:in <main>' 22: from /Library/Ruby/Gems/2.6.0/gems/bundler-2.1.4/lib/bundler.rb:174:in require'
21: from /Library/Ruby/Gems/2.6.0/gems/bundler-2.1.4/lib/bundler/runtime.rb:58:in require' 20: from /Library/Ruby/Gems/2.6.0/gems/bundler-2.1.4/lib/bundler/runtime.rb:58:in each'
19: from /Library/Ruby/Gems/2.6.0/gems/bundler-2.1.4/lib/bundler/runtime.rb:69:in block in require' 18: from /Library/Ruby/Gems/2.6.0/gems/bundler-2.1.4/lib/bundler/runtime.rb:69:in each'
17: from /Library/Ruby/Gems/2.6.0/gems/bundler-2.1.4/lib/bundler/runtime.rb:74:in block (2 levels) in require' 16: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in require'
15: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in require_with_bootsnap_lfi' 14: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in register'
13: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in block in require_with_bootsnap_lfi' 12: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in require'
11: from /Library/Ruby/Gems/2.6.0/gems/uglifier-4.2.0/lib/uglifier.rb:5:in <main>' 10: from /Library/Ruby/Gems/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in require'
9: from /Library/Ruby/Gems/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:257:in load_dependency' 8: from /Library/Ruby/Gems/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in block in require'
7: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in require' 6: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in require_with_bootsnap_lfi'
5: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in register' 4: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in block in require_with_bootsnap_lfi'
3: from /Library/Ruby/Gems/2.6.0/gems/bootsnap-1.4.8/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in require' 2: from /Library/Ruby/Gems/2.6.0/gems/execjs-2.7.0/lib/execjs.rb:4:in <main>'
1: from /Library/Ruby/Gems/2.6.0/gems/execjs-2.7.0/lib/execjs.rb:5:in <module:ExecJS>' /Library/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)