Railsサーバーが起動しない

Question

Progateを参考にしてRubyとRuby on Railsをインストールしました。
参考> Ruby on Railsの環境構築をしてみよう！(Windows)

エラーメッセージは以下の通りです。

C:\sample>rails s
=> Booting Puma
=> Rails 6.0.0 application starting in development
=> Run `rails server --help` for more startup options
RAILS_ENV=development environment is not defined in config/webpacker.yml, falling back to production environment
Exiting
Traceback (most recent call last):
        52: from bin/rails:4:in `<main>'
        51: from bin/rails:4:in `require'
        50: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/commands.rb:18:in `<top (required)>'
        49: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/command.rb:46:in `invoke'
        48: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/command/base.rb:65:in `perform'
.
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省略
.
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        35: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:49:in `new_from_string'
        34: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:49:in `eval'
        33: from config.ru:in `<main>'
        32: from config.ru:in `new'
        31: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:55:in `initialize'
        30: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:55:in `instance_eval'
        29: from config.ru:3:in `block in <main>'
        28: from config.ru:3:in `require_relative'
        27: from C:/sample/config/environment.rb:5:in `<top (required)>'
        26: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/application.rb:363:in `initialize!'
        25: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:60:in `run_initializers'
.
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省略
.
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         9: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/manifest.rb:18:in `refresh'
         8: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/manifest.rb:83:in `load'
         7: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:47:in `public_manifest_path'
         6: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:43:in `public_output_path'
         5: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:39:in `public_path'
         4: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:80:in `fetch'
         3: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:84:in `data'
         2: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:88:in `load'
         1: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:88:in `read'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:88:in `read': No such file or directory @ rb_sysopen - C:/sample/config/webpacker.yml (Errno::ENOENT)
        51: from bin/rails:4:in `<main>'
        50: from bin/rails:4:in `require'
        49: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/commands.rb:18:in `<top (required)>'
        48: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/command.rb:46:in `invoke'
.
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省略
.
.
        33: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:49:in `eval'
        32: from config.ru:in `<main>'
        31: from config.ru:in `new'
        30: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:55:in `initialize'
        29: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:55:in `instance_eval'
        28: from config.ru:3:in `block in <main>'
        27: from config.ru:3:in `require_relative'
        26: from C:/sample/config/environment.rb:5:in `<top (required)>'
        25: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/application.rb:363:in `initialize!'
        24: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/railties-6.0.0/lib/rails/initializable.rb:60:in `run_initializers'
        23: from C:/Ruby26-x64/lib/ruby/2.6.0/tsort.rb:205:in `tsort_each'
.
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省略
.
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         3: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:80:in `fetch'
         2: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:84:in `data'
         1: from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:87:in `load'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:91:in `rescue in load': Webpacker configuration file not found C:/sample/config/webpacker.yml. Please run rails webpacker:install Error: No such file or directory @ rb_sysopen - C:/sample/config/webpacker.yml (RuntimeError)

あまりにも長いので一部省略しています。

#試したこと
再インストール
node.jsのインストール

#補足情報
新しいアプリケーション(sample)を作ったときに以下のような色文字が出てました。
Could not find sqlite3-1.4.1 in any of the sources
Run bundle install to install missing gems.

C:\Ruby26-x64\binにはすでに
Sqlite3.dllとSqlite3.exeを入れました。

xamppをインストールしています。

Answer 1

C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/webpacker-4.0.7/lib/webpacker/configuration.rb:91:in `rescue in load': Webpacker configuration file not found C:/sample/config/webpacker.yml. Please run rails webpacker:install Error: No such file or directory @ rb_sysopen - C:/sample/config/webpacker.yml (RuntimeError)

エラーメッセージに「webpacker をインストールしてください。」と書いてあるので、webpacker をインストールしてみてください。

参考：Rails6 Webpackerでエラーが出た
https://qiita.com/libertyu/items/1eb74adc817ab8971100

Answer 2

ご回答ありがとうございます。
webpacker をインストールしてみましたが変わらずでした。
ちなみにyarn,nodeも再インストールしましたが変化無しでした。
ご確認の程、宜しくお願い致します。