Q&A
前提・実現したいこ
ここに質問の内容を詳しく書いてください。
rails sを行うとエラーが出てできない
発生している問題・エラーメッセージ
Could not find a JavaScript runtime. See https://github.com/rails/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
該当のソースコード
kujiranoMacBook-Pro:fumetti kujira$ rails s Traceback (most recent call last): 61: from bin/rails:3:in `<main>' 60: from bin/rails:3:in `load' 59: from /Users/kujira/projects/fumetti/bin/spring:15:in `<top (required)>' 58: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require' 57: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require' 56: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `<top (required)>' 55: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.1.0/lib/spring/binstub.rb:11:in `load' 54: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.1.0/bin/spring:49:in `<top (required)>' 53: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.1.0/lib/spring/client.rb:30:in `run' 52: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.1.0/lib/spring/client/command.rb:7:in `call' 51: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `call' 50: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.1.0/lib/spring/client/rails.rb:28:in `load' 49: from /Users/kujira/projects/fumetti/bin/rails:9:in `<top (required)>' 48: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:291:in `require' 47: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:257:in `load_dependency' 46: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:291:in `block in require' 45: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require' 44: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi' 43: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register' 42: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi' 41: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require' 40: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/railties-5.2.4.2/lib/rails/commands.rb:18:in `<top (required)>' 39: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/railties-5.2.4.2/lib/rails/command.rb:46:in `invoke' 38: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/railties-5.2.4.2/lib/rails/command/base.rb:69:in `perform' 37: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/thor-1.0.1/lib/thor.rb:392:in `dispatch' 36: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/thor-1.0.1/lib/thor/invocation.rb:127:in `invoke_command' 35: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/thor-1.0.1/lib/thor/command.rb:27:in `run' 34: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/railties-5.2.4.2/lib/rails/commands/server/server_command.rb:142:in `perform' 33: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/railties-5.2.4.2/lib/rails/commands/server/server_command.rb:142:in `tap' 32: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/railties-5.2.4.2/lib/rails/commands/server/server_command.rb:145:in `block in perform' 31: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:291:in `require' 30: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:257:in `load_dependency' 29: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:291:in `block in require' 28: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require' 27: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi' 26: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register' 25: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi' 24: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require' 23: from /Users/kujira/projects/fumetti/config/application.rb:7:in `<top (required)>' 22: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bundler-2.1.4/lib/bundler.rb:174:in `require' 21: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bundler-2.1.4/lib/bundler/runtime.rb:58:in `require' 20: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bundler-2.1.4/lib/bundler/runtime.rb:58:in `each' 19: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bundler-2.1.4/lib/bundler/runtime.rb:69:in `block in require' 18: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bundler-2.1.4/lib/bundler/runtime.rb:69:in `each' 17: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bundler-2.1.4/lib/bundler/runtime.rb:74:in `block (2 levels) in require' 16: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require' 15: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi' 14: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register' 13: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/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/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require' 11: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/uglifier-4.2.0/lib/uglifier.rb:5:in `<top (required)>' 10: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:291:in `require' 9: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:257:in `load_dependency' 8: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activesupport-5.2.4.2/lib/active_support/dependencies.rb:291:in `block in require' 7: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require' 6: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi' 5: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register' 4: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/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/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require' 2: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/execjs-2.7.0/lib/execjs.rb:4:in `<top (required)>' 1: from /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/execjs-2.7.0/lib/execjs.rb:5:in `<module:ExecJS>' /Users/kujira/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/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)
試したこと
ターミナルを強制的に落として再起動
ここに問題に対して試したことを記載してください。
補足情報（FW/ツールのバージョンなど）
ここにより詳細な情報を記載してください。
回答2件
0
環境構築の段階でしょうか？
もしRailsのバージョンが6であればJavaScriptの実行エンジンが必要なので
homebrewが入っているのでしたらbrew install yarnでうまくいくかもしれません。
投稿2020/05/11 02:52
総合スコア306
0
rails server でやってみたらどうですか？
それでもできなかったらローカル開発環境を構築してみてはいかかですか？
ローカル開発環境の構築の仕方はこちらから
投稿2020/05/11 02:46
総合スコア137
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