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Could not load the 'listen' gem. Add `gem 'listen'` to the development group of your Gemfile (LoadError)というエラーの解決法について

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Could not load the 'listen' gem. Add gem 'listen' to the development group of your Gemfile (LoadError)というエラーの解決法について

原因は、gemのlistenが開発環境にあることにある。
つまり、
gem 'listen'をdevelopmentだけではなく、全体に影響させればいいので、gemfileの最後に記述するとかして、bundle install bundle updateすれば、

解決するだろう。

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