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エラー:Could not find 'spring' (= 2.1.1) among 167 total gem(s) (Gem::MissingSpecError)

Posted at

環境

MacOS BigSur Ver11.5.2
Ruby 3.0.2
Rails 6.1.4.1

状況

RailsアプリをHerokuへデプロイした際に下記のエラーが発生

Could not find 'spring' (= 2.1.1) among 167 total gem(s) (Gem::MissingSpecError) 

原因

どうやらこのgemが悪さをしているらしい

Gemfile
group :development do
 (略)
  gem 'spring'
  gem 'spring-commands-rspec'
end

疑問点

developmentだけのgemなのになぜデプロイ時にエラーが出るのか謎

解決策

この2つのgemをコメントアウト

Gemfile
group :development do
 (略)
  # gem 'spring'
  # gem 'spring-commands-rspec'
end

bundle installも忘れずに!
デプロイし直すと正常にデプロイ完了!

参考

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