エラー内容
Could not find a JavaScript runtime. See https://github.com/rails/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
対処法
gem 'therubyracer' はハマりやすいのでやめたほうが良い。
Node.jsをインストール
https://nodejs.org/en/
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【Rails】Catalinaでrails sコマンド実行時に「Could not find a JavaScript runtime.」とエラーが出る場合の対処法
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