質問編集履歴
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| 23 23 | 
             
            【追記】
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            rubyはデフォルトでインストールされているものです。
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            +
            Gemfile全文↓
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            ```Gemfile
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            source 'https://rubygems.org'
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| 27 28 |  | 
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| 18 18 | 
             
            Gemfileを見てみても、特に文法上のエラーは見つからず、therubyracerのエラーだと思い、
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| 19 19 | 
             
            http://l-light-note.hatenablog.com/entry/2014/09/17/134807
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| 20 20 | 
             
            に従って色々試してみましたが、結果は変わりません。
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| 21 | 
            -
            改善策を教えてください。
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            +
            改善策を教えてください。
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            +
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            【追記】
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| 24 | 
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            rubyはデフォルトでインストールされているものです。
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            ```Gemfile
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            source 'https://rubygems.org'
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            git_source(:github) do |repo_name|
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              repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
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              "https://github.com/#{repo_name}.git"
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            end
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            # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
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            gem 'rails', '~> 5.1.5'
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            # Use sqlite3 as the database for Active Record
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            gem 'sqlite3'
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| 37 | 
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            # Use Puma as the app server
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            gem 'puma', '~> 3.7'
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            # Use SCSS for stylesheets
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            gem 'sass-rails', '~> 5.0'
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            # Use Uglifier as compressor for JavaScript assets
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            gem 'uglifier', '>= 1.3.0'
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            # See https://github.com/rails/execjs#readme for more supported runtimes
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            gem 'therubyracer', platforms: :ruby
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            # Use CoffeeScript for .coffee assets and views
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            gem 'coffee-rails', '~> 4.2'
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            # Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
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            gem 'turbolinks', '~> 5'
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            # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
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            gem 'jbuilder', '~> 2.5'
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            # Use Redis adapter to run Action Cable in production
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            # gem 'redis', '~> 4.0'
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            # Use ActiveModel has_secure_password
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            # gem 'bcrypt', '~> 3.1.7'
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            # Use Capistrano for deployment
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            # gem 'capistrano-rails', group: :development
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            group :development, :test do
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              # Call 'byebug' anywhere in the code to stop execution and get a debugger console
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              gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
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              # Adds support for Capybara system testing and selenium driver
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              gem 'capybara', '~> 2.13'
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              gem 'selenium-webdriver'
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            end
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            group :development do
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              # Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
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              gem 'web-console', '>= 3.3.0'
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              gem 'listen', '>= 3.0.5', '< 3.2'
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              # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
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              gem 'spring'
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              gem 'spring-watcher-listen', '~> 2.0.0'
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            end
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            # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
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            gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
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            gem 'sass'
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            gem 'unicorn'
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            ```
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            gem 'therubyracer',platforms: :ruby
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                                         ^. Bundler cannot continue.
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             #  from /vagrant/ | 
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             #  from /vagrant/project/Gemfile:19
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             #  -------------------------------------------
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| 11 11 | 
             
             #  # See https://github.com/rails/execjs#readme for more supported runtimes
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| 12 12 | 
             
             >  gem 'therubyracer',platforms: :ruby
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