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rails s が上手くいかない。rails newが作成できない時。

Posted at

簡潔に書くと、

rubyとrailsのバージョンの互換性

に問題がある場合がある。

その為、下記のURLを確認して見直すことをおすすめする。
もし、互換性がないものであればURL通りにRuby、railsを入れ直してみると解決する可能性がある。
https://www.hmallett.co.uk/2018/08/ruby-and-ruby-on-rails-version-compatibility/

補足:上記の方法は下記のようにPumaさえも立ち上がらない人向け

=> Rails 5.2.6 application starting in development
=> Run `rails server -h` for more startup options
*** SIGUSR2 not implemented, signal based restart unavailable!
*** SIGUSR1 not implemented, signal based restart unavailable!
*** SIGHUP not implemented, signal based logs reopening unavailable!     
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