Ruby On Railsでnewした時のエラーを解決したい

前提・実現したいこと

Railsを新しくやろうと思い、rails newをしたらnio4rのインストールエラーが発生しました

発生している問題・エラーメッセージ

Gem::InstallError: nio4r requires Ruby version >= 2.3.
An error occurred while installing nio4r (2.5.2), and Bundler cannot continue.
Make sure that gem install nio4r -v '2.5.2' succeeds before bundling.

該当のソースコード

Ruby On Rails

C:>rails new sample
create
create README.md
create Rakefile
create config.ru
create .gitignore
create Gemfile
create app
create app/assets/config/manifest.js
create app/assets/javascripts/application.js
create app/assets/javascripts/cable.js
create app/assets/stylesheets/application.css
create app/channels/application_cable/channel.rb
create app/channels/application_cable/connection.rb
create app/controllers/application_controller.rb
create app/helpers/application_helper.rb
create app/jobs/application_job.rb
create app/mailers/application_mailer.rb
create app/models/application_record.rb
create app/views/layouts/application.html.erb
create app/views/layouts/mailer.html.erb
create app/views/layouts/mailer.text.erb
create app/assets/images/.keep
create app/assets/javascripts/channels
create app/assets/javascripts/channels/.keep
create app/controllers/concerns/.keep
create app/models/concerns/.keep
create bin
create bin/bundle
create bin/rails
create bin/rake
create bin/setup
create bin/update
create config
create config/routes.rb
create config/application.rb
create config/environment.rb
create config/secrets.yml
create config/cable.yml
create config/puma.rb
create config/environments
create config/environments/development.rb
create config/environments/production.rb
create config/environments/test.rb
create config/initializers
create config/initializers/application_controller_renderer.rb
create config/initializers/assets.rb
create config/initializers/backtrace_silencers.rb
create config/initializers/cookies_serializer.rb
create config/initializers/cors.rb
create config/initializers/filter_parameter_logging.rb
create config/initializers/inflections.rb
create config/initializers/mime_types.rb
create config/initializers/new_framework_defaults.rb
create config/initializers/session_store.rb
create config/initializers/wrap_parameters.rb
create config/locales
create config/locales/en.yml
create config/boot.rb
create config/database.yml
create db
create db/seeds.rb
create lib
create lib/tasks
create lib/tasks/.keep
create lib/assets
create lib/assets/.keep
create log
create log/.keep
create public
create public/404.html
create public/422.html
create public/500.html
create public/apple-touch-icon-precomposed.png
create public/apple-touch-icon.png
create public/favicon.ico
create public/robots.txt
create test/fixtures
create test/fixtures/.keep
create test/fixtures/files
create test/fixtures/files/.keep
create test/controllers
create test/controllers/.keep
create test/mailers
create test/mailers/.keep
create test/models
create test/models/.keep
create test/helpers
create test/helpers/.keep
create test/integration
create test/integration/.keep
create test/test_helper.rb
create tmp
create tmp/.keep
create tmp/cache
create tmp/cache/assets
create vendor/assets/javascripts
create vendor/assets/javascripts/.keep
create vendor/assets/stylesheets
create vendor/assets/stylesheets/.keep
remove config/initializers/cors.rb
run bundle install
Fetching gem metadata from https://rubygems.org/..............
Fetching version metadata from https://rubygems.org/...
Fetching dependency metadata from https://rubygems.org/..
Resolving dependencies....
Using rake 13.0.1
Using concurrent-ruby 1.1.5
Using minitest 5.13.0
Using thread_safe 0.3.6
Using builder 3.2.4
Using erubis 2.7.0
Using mini_portile2 2.4.0
Using crass 1.0.5
Using rack 2.0.8
Installing nio4r 2.5.2 with native extensions
Using websocket-extensions 0.1.4
Using mini_mime 1.0.2
Using arel 7.1.4
Using bindex 0.8.1
Using bundler 1.13.6
Using coffee-script-source 1.12.2
Using execjs 2.7.0
Using method_source 0.9.2
Using thor 1.0.1
Using ffi 1.11.3
Using puma 3.12.2
Using rb-fsevent 0.10.3
Using tilt 2.0.10
Installing sqlite3 1.4.2 with native extensions
Using turbolinks-source 5.2.0
Installing i18n 1.7.0
Using tzinfo 1.2.6
Installing nokogiri 1.10.7
Using rack-test 0.6.3
Using sprockets 3.7.2
Gem::InstallError: nio4r requires Ruby version >= 2.3.
An error occurred while installing nio4r (2.5.2), and Bundler cannot continue.
Make sure that gem install nio4r -v '2.5.2' succeeds before bundling.

試したこと

・Rubyのバージョン確認
ruby 2.4.9p362 (2019-10-02 revision 67824) [x64-mingw32]

・railsのバージョン確認
Rails 5.0.0.1

行動規範の内容に同意します

回答1件

翻訳結果

Gem :: InstallError：nio4rには、2.3以上のRubyバージョンが必要です。
nio4r（2.5.2）のインストール中にエラーが発生し、Bundlerは続行できません。
バンドルする前に、gem install nio4r -v '2.5.2'が成功することを確認してください。

てあるようにバンドルする前に、gem install nio4r -v '2.5.2'が成功することを確認してください。

だそうです。

しっかりError書いてあるので試してみてから質問してください。

投稿2020/02/12 09:46