『rails s』でローカルサーバが立ち上がるようにお力添えいただけると幸いです。

●環境  
・mac os mojave 10.14.2  
・ruby 2.3.1p112  
・Rails 5.2.1  
・rbenv 1.1.1  
・Bundler version 1.17.2  
・Homebrew 2.0.0

●bin/rails s 後のエラー

```

    yoshidasachionoMacBook-Pro:profy yoshidayukio$ bin/rails s
    => Booting Puma
    => Rails 5.2.1 application starting in development
    => Run `rails server -h` for more startup options
    Exiting
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/rubygems_integration.rb:408:in `block (2 levels) in replace_gem': Error loading the 'mysql2' Active Record adapter. Missing a gem it depends on? can't activate mysql2 (< 0.6.0, >= 0.4.4), already activated mysql2-0.3.18. Make sure all dependencies are added to Gemfile. (Gem::LoadError)
    ~
    ~
    ~
    from bin/rails:3:in `load'
    from bin/rails:3:in `<main>'
    
```

●bin/bundle install 後の表示

```

    Using rake 12.3.2
    ~
    ~
    ~
    Bundle complete! 28 Gemfile dependencies, 107 gems now installed.
    Use `bundle info [gemname]` to see where a bundled gem is installed.
    
```

●gemfile

```

    source 'https://rubygems.org'
    git_source(:github) { |repo| "https://github.com/#{repo}.git" }
    ruby '2.3.1'
    gem 'rails', '5.2.1'
    gem "mysql2", "0.3.18"
    gem 'puma', '~> 3.11'
    gem 'sass-rails'
    gem 'uglifier', '>= 1.3.0'
    gem 'coffee-rails'
    gem 'turbolinks', '~> 5'
    gem 'jbuilder'
    gem 'bootsnap', '>= 1.1.0', require: false
    group :development, :test do
    gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
    end
    group :development do
    gem 'web-console', '>= 3.3.0'
    gem 'listen', '>= 3.0.5', '< 3.2'
    gem 'spring'
    gem 'spring-watcher-listen', '~> 2.0.0'
    end
    group :test do
    gem 'capybara', '>= 2.15'
    gem 'selenium-webdriver'
    gem 'chromedriver-helper'
    end
    gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
    gem 'pry-rails'
    gem 'devise'
    gem 'kaminari'
    gem 'therubyracer'
    gem 'twitter-bootstrap-rails'
    gem 'bootstrap-material-design', '0.1.4'
    gem 'jquery-rails'
    gem "font-awesome-rails"
    gem 'mini_magick'
    group :production do
    gem 'rails_12factor'
    end
    
```

●gemfileのmysqlを"0.4.4"へ修正後のエラー  
-bash: bin/install: No such file or directory

●bin/bundle installを実行後のエラー

```

    yoshidasachionoMacBook-Pro:profy yoshidayukio$ bin/bundle install
    --- ERROR REPORT TEMPLATE ---
    # Error Report
    ## Questions
    Please fill out answers to these questions, it'll help us figure out
    why things are going wrong.
    - **What did you do?**
      I ran the command `bin/bundle install`
    - **What did you expect to happen?**
      I expected Bundler to...
    - **What happened instead?**
      Instead, what happened was...
    - **Have you tried any solutions posted on similar issues in our issue tracker, stack overflow, or google?**
      I tried...
    - **Have you read our issues document, https://github.com/bundler/bundler/blob/master/doc/contributing/ISSUES.md?**
      ...
    ## Backtrace
    ```
    Errno::EPERM: Failed to open TCP connection to index.rubygems.org:443 (Operation not permitted - connect(2) for "index.rubygems.org" port 443)
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/2.3.0/net/http.rb:882:in `rescue in block in connect'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/2.3.0/net/http.rb:879:in `block in connect'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/2.3.0/timeout.rb:91:in `block in timeout'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/2.3.0/timeout.rb:101:in `timeout'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/2.3.0/net/http.rb:878:in `connect'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/2.3.0/net/http.rb:863:in `do_start'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/2.3.0/net/http.rb:858:in `start'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/vendor/net-http-persistent/lib/net/http/persistent.rb:702:in `start'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/vendor/net-http-persistent/lib/net/http/persistent.rb:967:in `reset'  /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/vendor/net-http-persistent/lib/net/http/persistent.rb:630:in `connection_for'  /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/vendored_persistent.rb:23:in `connection_for'  /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/vendor/net-http-persistent/lib/net/http/persistent.rb:996:in `request'  /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/fetcher/downloader.rb:56:in `request'  /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/fetcher/downloader.rb:17:in `fetch'  /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/fetcher/dependency.rb:10:in `available?'  /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/fetcher.rb:158:in `use_api'  /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/source/rubygems.rb:382:in `block in api_fetchers'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/source/rubygems.rb:382:in `select'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/source/rubygems.rb:382:in `api_fetchers'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/source/rubygems.rb:387:in `block in remote_specs'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/index.rb:11:in `build'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/source/rubygems.rb:386:in `remote_specs'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/source/rubygems.rb:89:in `specs'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/definition.rb:273:in `block (2 levels) in index'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/definition.rb:271:in `each'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/definition.rb:271:in `block in index'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/index.rb:11:in `build'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/definition.rb:268:in `index'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/definition.rb:258:in `resolve'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/definition.rb:170:in `specs'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/definition.rb:158:in `resolve_remotely!'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/installer.rb:310:in `resolve_if_needed'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/installer.rb:84:in `block in run'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/process_lock.rb:12:in `block in lock'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/process_lock.rb:9:in `open'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/process_lock.rb:9:in `lock'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/installer.rb:73:in `run'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/installer.rb:25:in `install'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/cli/install.rb:65:in `run'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/cli.rb:235:in `block in install'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/settings.rb:143:in `temporary'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/cli.rb:234:in `install'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/cli.rb:27:in `dispatch'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/cli.rb:18:in `start'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/exe/bundle:30:in `block in <top (required)>'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/lib/bundler/friendly_errors.rb:124:in `with_friendly_errors'
    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.17.2/exe/bundle:22:in `<top (required)>'
      bin/bundle:3:in `load'
      bin/bundle:3:in `<main>'
    ```
    ## Environment
    ```
    Bundler       1.17.2
      Platforms   ruby, x86_64-darwin-17
    Ruby          2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin17]
      Full Path   /Users/yoshidayukio/.rbenv/versions/2.3.1/bin/ruby
      Config Dir  /Users/yoshidayukio/.rbenv/versions/2.3.1/etc
    RubyGems      2.5.1
      Gem Home    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0
      Gem Path    /Users/yoshidayukio/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0:/Users/yoshidayukio/.gem/ruby/2.3.0
      User Path   /Users/yoshidayukio/.gem/ruby/2.3.0
      Bin Dir     /Users/yoshidayukio/.rbenv/versions/2.3.1/bin
    OpenSSL       
      Compiled    OpenSSL 1.0.2o  27 Mar 2018
      Loaded      OpenSSL 1.0.2q  20 Nov 2018
      Cert File   /usr/local/etc/openssl/cert.pem
      Cert Dir    /usr/local/etc/openssl/certs
    Tools         
      Git         2.19.1
      RVM         not installed
      rbenv       rbenv 1.1.1
      chruby      not installed
    ```
    ## Bundler Build Metadata
    ```
    Built At          2018-12-11
    Git SHA           43e950846
    Released Version  true
    ```
    ## Bundler settings
    ```
    gemfile
      Set via BUNDLE_GEMFILE: "/Users/yoshidayukio/projects/profy/Gemfile"
    ```
    ## Gemfile
    ### Gemfile
    ```ruby
    source 'https://rubygems.org'
    git_source(:github) { |repo| "https://github.com/#{repo}.git" }
    ruby '2.3.1'
    # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
    gem 'rails', '5.2.1'
    # Use mysql as the database for Active Record
    gem "mysql2", "0.4.4"
    # Use Puma as the app server
    gem 'puma', '~> 3.11'
    # Use SCSS for stylesheets
    gem 'sass-rails'
    # Use Uglifier as compressor for JavaScript assets
    gem 'uglifier', '>= 1.3.0'
    # See https://github.com/rails/execjs#readme for more supported runtimes
    # gem 'mini_racer', platforms: :ruby
    # Use CoffeeScript for .coffee assets and views
    gem 'coffee-rails'
    # Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
    gem 'turbolinks', '~> 5'
    # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
    gem 'jbuilder'
    # Use Redis adapter to run Action Cable in production
    # gem 'redis', '~> 4.0'
    # Use ActiveModel has_secure_password
    # gem 'bcrypt', '~> 3.1.7'
    # Use ActiveStorage variant
    # gem 'mini_magick', '~> 4.8'
    # Use Capistrano for deployment
    # gem 'capistrano-rails', group: :development
    # Reduces boot times through caching; required in config/boot.rb
    gem 'bootsnap', '>= 1.1.0', require: false
    group :development, :test do
      # Call 'byebug' anywhere in the code to stop execution and get a debugger console
      gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
    end
    group :development do
      # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
      gem 'web-console', '>= 3.3.0'
      gem 'listen', '>= 3.0.5', '< 3.2'
      # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
      gem 'spring'
      gem 'spring-watcher-listen', '~> 2.0.0'
    end
    group :test do
      # Adds support for Capybara system testing and selenium driver
      gem 'capybara', '>= 2.15'
      gem 'selenium-webdriver'
      # Easy installation and use of chromedriver to run system tests with Chrome
      gem 'chromedriver-helper'
    end
    # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
    gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
    gem 'pry-rails'
    gem 'devise'
    gem 'kaminari'
    gem 'therubyracer'
    gem 'twitter-bootstrap-rails'
    gem 'bootstrap-material-design', '0.1.4'
    gem 'jquery-rails'
    gem "font-awesome-rails"
    gem 'mini_magick'
    group :production do
      gem 'rails_12factor'
    end
    ```
    ### Gemfile.lock
    ```
    GEM
      remote: https://rubygems.org/
      specs:
        actioncable (5.2.1)
          actionpack (= 5.2.1)
          nio4r (~> 2.0)
          websocket-driver (>= 0.6.1)
        actionmailer (5.2.1)
          actionpack (= 5.2.1)
          actionview (= 5.2.1)
          activejob (= 5.2.1)
          mail (~> 2.5, >= 2.5.4)
          rails-dom-testing (~> 2.0)
        actionpack (5.2.1)
          actionview (= 5.2.1)
          activesupport (= 5.2.1)
          rack (~> 2.0)
          rack-test (>= 0.6.3)
          rails-dom-testing (~> 2.0)
          rails-html-sanitizer (~> 1.0, >= 1.0.2)
        actionview (5.2.1)
          activesupport (= 5.2.1)
          builder (~> 3.1)
          erubi (~> 1.4)
          rails-dom-testing (~> 2.0)
          rails-html-sanitizer (~> 1.0, >= 1.0.3)
        activejob (5.2.1)
          activesupport (= 5.2.1)
          globalid (>= 0.3.6)
        activemodel (5.2.1)
          activesupport (= 5.2.1)
        activerecord (5.2.1)
          activemodel (= 5.2.1)
          activesupport (= 5.2.1)
          arel (>= 9.0)
        activestorage (5.2.1)
          actionpack (= 5.2.1)
          activerecord (= 5.2.1)
          marcel (~> 0.3.1)
        activesupport (5.2.1)
          concurrent-ruby (~> 1.0, >= 1.0.2)
          i18n (>= 0.7, < 2)
          minitest (~> 5.1)
          tzinfo (~> 1.1)
        addressable (2.6.0)
          public_suffix (>= 2.0.2, < 4.0)
        archive-zip (0.11.0)
          io-like (~> 0.3.0)
        arel (9.0.0)
        autoprefixer-rails (9.4.7)
          execjs
        bcrypt (3.1.12)
        bcrypt (3.1.12-java)
        bcrypt (3.1.12-x64-mingw32)
        bcrypt (3.1.12-x86-mingw32)
        bindex (0.5.0)
        bootsnap (1.3.2)
          msgpack (~> 1.0)
        bootsnap (1.3.2-java)
          msgpack (~> 1.0)
        bootstrap-material-design (0.1.4)
          bootstrap-sass (~> 3.0)
        bootstrap-sass (3.3.7)
          autoprefixer-rails (>= 5.2.1)
          sass (>= 3.3.4)
        builder (3.2.3)
        byebug (10.0.2)
        capybara (3.13.2)
          addressable
          mini_mime (>= 0.1.3)
          nokogiri (~> 1.8)
          rack (>= 1.6.0)
          rack-test (>= 0.6.3)
          regexp_parser (~> 1.2)
          xpath (~> 3.2)
        childprocess (0.9.0)
          ffi (~> 1.0, >= 1.0.11)
        chromedriver-helper (2.1.0)
          archive-zip (~> 0.10)
          nokogiri (~> 1.8)
        coderay (1.1.2)
        coffee-rails (4.2.2)
          coffee-script (>= 2.2.0)
          railties (>= 4.0.0)
        coffee-script (2.4.1)
          coffee-script-source
          execjs
        coffee-script-source (1.12.2)
        commonjs (0.2.7)
        concurrent-ruby (1.1.4)
        crass (1.0.4)
        devise (4.6.0)
          bcrypt (~> 3.0)
          orm_adapter (~> 0.1)
          railties (>= 4.1.0, < 6.0)
          responders
          warden (~> 1.2.3)
        erubi (1.8.0)
        execjs (2.7.0)
        ffi (1.10.0)
        ffi (1.10.0-java)
        ffi (1.10.0-x64-mingw32)
        ffi (1.10.0-x86-mingw32)
        font-awesome-rails (4.7.0.4)
          railties (>= 3.2, < 6.0)
        globalid (0.4.2)
          activesupport (>= 4.2.0)
        i18n (1.5.3)
          concurrent-ruby (~> 1.0)
        io-like (0.3.0)
        jbuilder (2.8.0)
          activesupport (>= 4.2.0)
          multi_json (>= 1.2)
        jquery-rails (4.3.3)
          rails-dom-testing (>= 1, < 3)
          railties (>= 4.2.0)
          thor (>= 0.14, < 2.0)
        kaminari (1.1.1)
          activesupport (>= 4.1.0)
          kaminari-actionview (= 1.1.1)
          kaminari-activerecord (= 1.1.1)
          kaminari-core (= 1.1.1)
        kaminari-actionview (1.1.1)
          actionview
          kaminari-core (= 1.1.1)
        kaminari-activerecord (1.1.1)
          activerecord
          kaminari-core (= 1.1.1)
        kaminari-core (1.1.1)
        less (2.6.0)
          commonjs (~> 0.2.7)
        less-rails (2.8.0)
          actionpack (>= 4.0)
          less (~> 2.6.0)
          sprockets (> 2, < 4)
          tilt
        libv8 (3.16.14.19)
        listen (3.1.5)
          rb-fsevent (~> 0.9, >= 0.9.4)
          rb-inotify (~> 0.9, >= 0.9.7)
          ruby_dep (~> 1.2)
        loofah (2.2.3)
          crass (~> 1.0.2)
          nokogiri (>= 1.5.9)
        mail (2.7.1)
          mini_mime (>= 0.1.1)
        marcel (0.3.3)
          mimemagic (~> 0.3.2)
        method_source (0.9.2)
        mimemagic (0.3.3)
        mini_magick (4.9.2)
        mini_mime (1.0.1)
        mini_portile2 (2.4.0)
        minitest (5.11.3)
        msgpack (1.2.6)
        msgpack (1.2.6-java)
        msgpack (1.2.6-x64-mingw32)
        msgpack (1.2.6-x86-mingw32)
        multi_json (1.13.1)
        mysql2 (0.3.18)
        mysql2 (0.3.18-x64-mingw32)
        mysql2 (0.3.18-x86-mingw32)
        mysql2 (0.3.18-x86-mswin32-60)
        nio4r (2.3.1)
        nio4r (2.3.1-java)
        nokogiri (1.10.1)
          mini_portile2 (~> 2.4.0)
        nokogiri (1.10.1-java)
        nokogiri (1.10.1-x64-mingw32)
          mini_portile2 (~> 2.4.0)
        nokogiri (1.10.1-x86-mingw32)
          mini_portile2 (~> 2.4.0)
        orm_adapter (0.5.0)
        pry (0.12.2)
          coderay (~> 1.1.0)
          method_source (~> 0.9.0)
        pry (0.12.2-java)
          coderay (~> 1.1.0)
          method_source (~> 0.9.0)
          spoon (~> 0.0)
        pry-rails (0.3.9)
          pry (>= 0.10.4)
        public_suffix (3.0.3)
        puma (3.12.0)
        puma (3.12.0-java)
        rack (2.0.6)
        rack-test (1.1.0)
          rack (>= 1.0, < 3)
        rails (5.2.1)
          actioncable (= 5.2.1)
          actionmailer (= 5.2.1)
          actionpack (= 5.2.1)
          actionview (= 5.2.1)
          activejob (= 5.2.1)
          activemodel (= 5.2.1)
          activerecord (= 5.2.1)
          activestorage (= 5.2.1)
          activesupport (= 5.2.1)
          bundler (>= 1.3.0)
          railties (= 5.2.1)
          sprockets-rails (>= 2.0.0)
        rails-dom-testing (2.0.3)
          activesupport (>= 4.2.0)
          nokogiri (>= 1.6)
        rails-html-sanitizer (1.0.4)
          loofah (~> 2.2, >= 2.2.2)
        rails_12factor (0.0.3)
          rails_serve_static_assets
          rails_stdout_logging
        rails_serve_static_assets (0.0.5)
        rails_stdout_logging (0.0.5)
        railties (5.2.1)
          actionpack (= 5.2.1)
          activesupport (= 5.2.1)
          method_source
          rake (>= 0.8.7)
          thor (>= 0.19.0, < 2.0)
        rake (12.3.2)
        rb-fsevent (0.10.3)
        rb-inotify (0.10.0)
          ffi (~> 1.0)
        ref (2.0.0)
        regexp_parser (1.3.0)
        responders (2.4.1)
          actionpack (>= 4.2.0, < 6.0)
          railties (>= 4.2.0, < 6.0)
        ruby_dep (1.5.0)
        rubyzip (1.2.2)
        sass (3.7.3)
          sass-listen (~> 4.0.0)
        sass-listen (4.0.0)
          rb-fsevent (~> 0.9, >= 0.9.4)
          rb-inotify (~> 0.9, >= 0.9.7)
        sass-rails (5.0.7)
          railties (>= 4.0.0, < 6)
          sass (~> 3.1)
          sprockets (>= 2.8, < 4.0)
          sprockets-rails (>= 2.0, < 4.0)
          tilt (>= 1.1, < 3)
        selenium-webdriver (3.141.0)
          childprocess (~> 0.5)
          rubyzip (~> 1.2, >= 1.2.2)
        spoon (0.0.6)
          ffi
        spring (2.0.2)
          activesupport (>= 4.2)
        spring-watcher-listen (2.0.1)
          listen (>= 2.7, < 4.0)
          spring (>= 1.2, < 3.0)
        sprockets (3.7.2)
          concurrent-ruby (~> 1.0)
          rack (> 1, < 3)
        sprockets-rails (3.2.1)
          actionpack (>= 4.0)
          activesupport (>= 4.0)
          sprockets (>= 3.0.0)
        therubyracer (0.12.3)
          libv8 (~> 3.16.14.15)
          ref
        thor (0.20.3)
        thread_safe (0.3.6)
        thread_safe (0.3.6-java)
        tilt (2.0.9)
        turbolinks (5.2.0)
          turbolinks-source (~> 5.2)
        turbolinks-source (5.2.0)
        twitter-bootstrap-rails (4.0.0)
          actionpack (~> 5.0, >= 5.0.1)
          execjs (~> 2.7)
          less-rails (~> 2.8, >= 2.8.0)
          railties (~> 5.0, >= 5.0.1)
        tzinfo (1.2.5)
          thread_safe (~> 0.1)
        tzinfo-data (1.2018.9)
          tzinfo (>= 1.0.0)
        uglifier (4.1.20)
          execjs (>= 0.3.0, < 3)
        warden (1.2.8)
          rack (>= 2.0.6)
        web-console (3.7.0)
          actionview (>= 5.0)
          activemodel (>= 5.0)
          bindex (>= 0.4.0)
          railties (>= 5.0)
        websocket-driver (0.7.0)
          websocket-extensions (>= 0.1.0)
        websocket-driver (0.7.0-java)
          websocket-extensions (>= 0.1.0)
        websocket-extensions (0.1.3)
        xpath (3.2.0)
          nokogiri (~> 1.8)
    
    PLATFORMS
      java
      ruby
      x64-mingw32
      x86-mingw32
      x86-mswin32
    DEPENDENCIES
      bootsnap (>= 1.1.0)
      bootstrap-material-design (= 0.1.4)
      byebug
      capybara (>= 2.15)
      chromedriver-helper
      coffee-rails
      devise
      font-awesome-rails
      jbuilder
      jquery-rails
      kaminari
      listen (>= 3.0.5, < 3.2)
      mini_magick
      mysql2 (= 0.3.18)
      pry-rails
      puma (~> 3.11)
      rails (= 5.2.1)
      rails_12factor
      sass-rails
      selenium-webdriver
      spring
      spring-watcher-listen (~> 2.0.0)
      therubyracer
      turbolinks (~> 5)
      twitter-bootstrap-rails
      tzinfo-data
      uglifier (>= 1.3.0)
      web-console (>= 3.3.0)
    
    RUBY VERSION
       ruby 2.3.1p112
    BUNDLED WITH
       1.17.2
    ```
    --- TEMPLATE END ---
    Unfortunately, an unexpected error occurred, and Bundler cannot continue.
    First, try this link to see if there are any existing issue reports for this error:
    https://github.com/bundler/bundler/search?q=Failed+to+open+TCP+connection+to+index.rubygems.org+443+%28Operation+not+permitted+-+connect%282%29+for+%22index.rubygems.org%22+port+443%29&type=Issues
    If there aren't any reports for this error yet, please create copy and paste the report template above into a new issue. Don't forget to anonymize any private data! The new issue form is located at:
    https://github.com/bundler/bundler/issues/new
    
```
CC BY-SA 4.0
2019-02-10T07:36:36.333
52676
2019-02-23T05:50:15.097
2019-02-23T05:50:15.097
31847
31847
question
ruby-on-rails
ローカル環境で『rails s』でサーバが立ち上がらない
mysql2 gem のバージョンが古いために、エラーが発生しているようです。

0.4.4 以上、 0.6.0 未満のバージョンを Gemfile にて指定することで解決すると思います。

具体的には、 1. Gemfile の mysql2 の記述を以下のように変えて

```

    gem "mysql2", "0.4.4"
    
```

つぎに、 `bin/bundle install` する。
CC BY-SA 4.0
2019-02-18T01:39:18.520
52842
2019-02-23T05:20:12.427
2019-02-23T05:20:12.427
754
754
52676
answer