bcryptにエラーがでている

Question

いつもお世話になっております。
railsチュートリアル（6.3.1)を学習しているのですが、行き詰ってしまいました。
cannot load such file -- bcrypt_ext (LoadError)と書いてあるのでですが、どうすればいいでしょうか？調べたのですが解決方法がわかりません。ご教授お願いします。

C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bcrypt-3.1.11-x64-mingw32/lib/bcrypt.rb:16:in require': cannot load such file -- bcrypt_ext (LoadError) from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bcrypt-3.1.11-x64-mingw32/lib/bcrypt.rb:16:in rescue in <top (required)>'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bcrypt-3.1.11-x64-mingw32/lib/bcrypt.rb:12:in <top (required)>' from C:/Ruby24-x64/lib/ruby/site_ruby/2.4.0/bundler/runtime.rb:81:in require'
from C:/Ruby24-x64/lib/ruby/site_ruby/2.4.0/bundler/runtime.rb:81:in block (2 levels) in require' from C:/Ruby24-x64/lib/ruby/site_ruby/2.4.0/bundler/runtime.rb:76:in each'
from C:/Ruby24-x64/lib/ruby/site_ruby/2.4.0/bundler/runtime.rb:76:in block in require' from C:/Ruby24-x64/lib/ruby/site_ruby/2.4.0/bundler/runtime.rb:65:in each'
from C:/Ruby24-x64/lib/ruby/site_ruby/2.4.0/bundler/runtime.rb:65:in require' from C:/Ruby24-x64/lib/ruby/site_ruby/2.4.0/bundler.rb:114:in require'
from C:/Users/sk/programming/sample_app/config/application.rb:7:in <top (required)>' from C:/Users/sk/programming/sample_app/config/environment.rb:2:in require_relative'
from C:/Users/sk/programming/sample_app/config/environment.rb:2:in <top (required)>' from C:/Users/sk/programming/sample_app/test/test_helper.rb:1:in require'
from C:/Users/sk/programming/sample_app/test/test_helper.rb:1:in <top (required)>' from C:/Users/sk/programming/sample_app/test/controllers/static_pages_controller_test.rb:1:in require'
from C:/Users/sk/programming/sample_app/test/controllers/static_pages_controller_test.rb:1:in <top (required)>' from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/test_unit/runner.rb:50:in require'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/test_unit/runner.rb:50:in block in load_tests' from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/test_unit/runner.rb:50:in each'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/test_unit/runner.rb:50:in load_tests' from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/test_unit/runner.rb:39:in run'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/commands/test/test_command.rb:38:in perform' from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/command.rb:27:in run'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in invoke_command' from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor.rb:387:in dispatch'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/command/base.rb:63:in perform' from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/command.rb:44:in invoke'
from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/commands.rb:16:in <top (required)>' from bin/rails:4:in require'
from bin/rails:4:in `<main>'

Answer 1

よくある事例のようです。

1. gem uninstall bcrypt を実行
2. gem uninstall bcrypt-ruby を実行
3. gem install bcrypt --platform=rubyを実行
4. Gemfileにgem 'bcrypt', '~> 3.1.11'を記載
5. bundle installを実行