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rails sがうまくいかなかった

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背景
railsのバージョンを6.1.6.1 → 6.1.4.4に変更。
変更前はエラーが多発していた
1.
Running via Spring preloader in process ~
2.
gemでgemfile.lockにインストールされていない
3.
rails s
rails db:migrate
rails db:seed

バージョンによる問題、バージョンが理由ではない問題に
切り離して考えてみた。

問題が起こる前の挙動
gemfile
gem 'activeadmin'
gem 'devise'
gem 'net-smtp'
を追加して、
bundle install —path vendor/bundle

実行
❯ rails s

=> Booting Puma
=> Rails 6.1.6.1 application starting in development
=> Run bin/rails server --help for more startup options
Exiting
/Users/~/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/webpacker-5.4.3/lib/webpacker/configuration.rb:103:in `rescue in load': Webpacker configuration file not found /Users/~/active_admin_sample/config/webpacker.yml. Please run rails webpacker:install Error: No such file or directory @ rb_sysopen - /Users/~/Desktop/program/active_admin_sample/config/webpacker.yml (RuntimeError)
がかえってくる。

エラー内容の特定:
どこ)configuration.rb:103:in `rescue in load': Webpacker configuration file not found
何)Please run rails webpacker

よって、
以下を実行
rails webpacker:install
bundle install
yarn install

実行結果、なんとか無事にパス
yarn installの意味もパッケージ関係としておさえておきます

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