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bundle installでエラーが出て、pumaがインストールできない。 - Qiita
Heroku Gem::LoadError: Specified 'sqlite3' for database adapter, but the gem is not loaded. Add gem 'sqlite3' to you Gemfile « panxiubin's Blog
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Error loading the 'sqlite3' Active Record adapter. Missing a gem it depends on? sqlite3 is not part of the bundle. Add it to your Gemfile for heroku - Stack Overflow
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