Narou.rb のバージョン：
3.8.0
OS のバージョン：
Windows 10 Home 21H1
何が起きたのか：
ここ数日、エラーが発生し小説データがダウンロードできない。
再現方法（何をやったら起こったのか詳細に）：
narouコマンドを実行すると常に下記のエラーが発生し、何もできない。
一度rubyも含めすべて削除＆再インストールした直後には動いたりすることもありますがすぐにエラーが発生してしまいます。
C:/tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:17: warning: already initialized constant Helper::HOST_OS
C:/Tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:17: warning: previous definition of HOST_OS was here
C:/tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:18: warning: already initialized constant Helper::FILENAME_LENGTH_LIMIT
C:/Tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:18: warning: previous definition of FILENAME_LENGTH_LIMIT was here
C:/tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:19: warning: already initialized constant Helper::FOLDER_LENGTH_LIMIT
C:/Tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:19: warning: previous definition of FOLDER_LENGTH_LIMIT was here
C:/tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:98: warning: already initialized constant Helper::HR_TEXT
C:/Tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:98: warning: previous definition of HR_TEXT was here
C:/tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:137: warning: already initialized constant Helper::ENTITIES
C:/Tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:137: warning: previous definition of ENTITIES was here
C:/tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:254: warning: already initialized constant Helper::INTEGER_CLASS
C:/Tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:254: warning: previous definition of INTEGER_CLASS was here
C:/tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:255: warning: already initialized constant Helper::TYPE_OF_VALUE
C:/Tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:255: warning: previous definition of TYPE_OF_VALUE was here
C:/tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:454: warning: already initialized constant Helper::CacheLoader::DEFAULT_OPTIONS
C:/Tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/helper.rb:454: warning: previous definition of DEFAULT_OPTIONS was here
C:/tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/narou.rb:19: warning: already initialized constant Narou::LOCAL_SETTING_DIR_NAME
C:/Tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/narou.rb:19: warning: previous definition of LOCAL_SETTING_DIR_NAME was here
C:/tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/narou.rb:20: warning: already initialized constant Narou::GLOBAL_SETTING_DIR_NAME
C:/Tools/Ruby30/lib/ruby/gems/3.0.0/gems/narou-3.8.0/lib/narou.rb:20: warning: previous definition of GLOBAL_SETTING_DIR_NAME was here
