rails sができない時の対処方

rails sを叩くとエラー出力

spring stopを試して解決できず少し詰まったので備忘録として残します。

/Users/arakitakuro/.rbenv/versions/2.5.1/lib/ruby/2.5.0/fileutils.rb:90: warning: already initialized constant FileUtils::VERSION
/Users/arakitakuro/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/fileutils-1.4.1/lib/fileutils.rb:105: warning: previous definition of VERSION was here
/Users/arakitakuro/.rbenv/versions/2.5.1/lib/ruby/2.5.0/fileutils.rb:1188: warning: already initialized constant FileUtils::Entry_::S_IF_DOOR
/Users/arakitakuro/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/fileutils-1.4.1/lib/fileutils.rb:1284: warning: previous definition of S_IF_DOOR was here
/Users/arakitakuro/.rbenv/versions/2.5.1/lib/ruby/2.5.0/fileutils.rb:1446: warning: already initialized constant FileUtils::Entry_::DIRECTORY_TERM
/Users/arakitakuro/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/fileutils-1.4.1/lib/fileutils.rb:1568: warning: previous definition of DIRECTORY_TERM was here
/Users/arakitakuro/.rbenv/versions/2.5.1/lib/ruby/2.5.0/fileutils.rb:1501: warning: already initialized constant FileUtils::OPT_TABLE
/Users/arakitakuro/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/fileutils-1.4.1/lib/fileutils.rb:1626: warning: previous definition of OPT_TABLE was here
/Users/arakitakuro/.rbenv/versions/2.5.1/lib/ruby/2.5.0/fileutils.rb:1555: warning: already initialized constant FileUtils::LOW_METHODS
/Users/arakitakuro/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/fileutils-1.4.1/lib/fileutils.rb:1685: warning: previous definition of LOW_METHODS was here
/Users/arakitakuro/.rbenv/versions/2.5.1/lib/ruby/2.5.0/fileutils.rb:1562: warning: already initialized constant FileUtils::METHODS
/Users/arakitakuro/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/fileutils-1.4.1/lib/fileutils.rb:1692: warning: previous definition of METHODS was here
=> Booting Puma
=> Rails 5.2.4.1 application starting in development 
=> Run `rails server -h` for more startup options
Puma starting in single mode...
* Version 3.12.4 (ruby 2.5.1-p57), codename: Llamas in Pajamas
* Min threads: 5, max threads: 5
* Environment: development
Exiting
Traceback (most recent call last):
	44: from bin/rails:3:in `<main>'
	43: from bin/rails:3:in `load'
以下略

原因

rails sしたままターミナルを閉じたのが原因でした。

解決方法

下記コマンドを入力し、出力されるPIDをコピー

lsof -i :3000 #PIDを確認

kill -QUIT PIDをペースト

これで解決しました。