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rails s の実行で、エラー「no acceptor (port is in use or requires root privileges) (RuntimeError)」

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$rails s
でrails startによるサーバーを立ち上げようとしたら、以下のエラーが発生。

`start_tcp_server': no acceptor (port is in use or requires root privileges) (RuntimeError)

start_tcp_server(tcpプロトコルで、サーバーを立ち上げる意味??)メソッドを実行する際に、
RuntimeError(実行時のエラーが発生)が発生。その理由は、受け取り手がいない(ポートが使用中か、ルート権限を要求している最中)と言われています。

なので、$ps aux | rails sで、立ち上がっているrailsのプロセスをkillして再度、rails sで開始で動きます

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