Rails 5 `initialize': Permission denied @ rb_sysopen エラー

Question

`initialize': Permission denied @ rb_sysopenエラーが出てしまい、scaffoldができない状況です。
destoryしてみても変わりません…。
他の名前でならscaffoldできるのですが。

変な操作はしてないのですが…なぜ急にできなくなったのでしょうか。

PS C:\pg\RAILS\devise> rails generate scaffold Hashmodel title:string content:text
      invoke  active_record
   identical    db/migrate/20180707032214_create_hashmodels.rb
   identical    app/models/hashmodel.rb
      invoke    test_unit
   identical      test/models/hashmodel_test.rb
   identical      test/fixtures/hashmodels.yml
      invoke  resource_route
       route    resources :hashmodels
      invoke  scaffold_controller
   identical    app/controllers/hashmodels_controller.rb
      invoke    erb
       exist      app/views/hashmodels
C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/actions/create_file.rb:63:in `initialize': Permission denied @ rb_sysopen - C:/pg/RAILS/devise/app/views/hashmodels/index.html.erb (Errno::EACCES)
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/actions/create_file.rb:63:in `open'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/actions/create_file.rb:63:in `block in invoke!'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/actions/empty_directory.rb:117:in `invoke_with_conflict_check'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/actions/create_file.rb:60:in `invoke!'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/actions.rb:94:in `action'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/actions/create_file.rb:25:in `create_file'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/actions/file_manipulation.rb:119:in `template'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.2.0/lib/rails/generators/named_base.rb:25:in `block in template'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.2.0/lib/rails/generators/named_base.rb:49:in `inside_template'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.2.0/lib/rails/generators/named_base.rb:24:in `template'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.2.0/lib/rails/generators/erb/scaffold/scaffold_generator.rb:21:in `block (2 levels) in copy_view_files'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.2.0/lib/rails/generators/erb/scaffold/scaffold_generator.rb:19:in `each'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.2.0/lib/rails/generators/erb/scaffold/scaffold_generator.rb:19:in `block in copy_view_files'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.2.0/lib/rails/generators/erb/scaffold/scaffold_generator.rb:18:in `each'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.2.0/lib/rails/generators/erb/scaffold/scaffold_generator.rb:18:in `copy_view_files'
        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/invocation.rb:133:in `block in invoke_all'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `each'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `map'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `invoke_all'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/group.rb:232:in `dispatch'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:115:in `invoke'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.2.0/lib/rails/generators/rails/scaffold_controller/scaffold_controller_generator.rb:26:in `block in <class:ScaffoldControllerGenerator>'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/group.rb:274:in `instance_exec'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/group.rb:274:in `block in _invoke_for_class_method'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/shell.rb:68:in `with_padding'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/group.rb:266:in `_invoke_for_class_method'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/group.rb:133:in `_invoke_from_option_template_engine'
        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/invocation.rb:133:in `block in invoke_all'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `each'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `map'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `invoke_all'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/group.rb:232:in `dispatch'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:115:in `invoke'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/group.rb:277:in `block in _invoke_for_class_method'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/shell.rb:68:in `with_padding'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/group.rb:266:in `_invoke_for_class_method'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/group.rb:133:in `_invoke_from_option_scaffold_controller'
        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/invocation.rb:133:in `block in invoke_all'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `each'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `map'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in `invoke_all'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/group.rb:232:in `dispatch'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/base.rb:466:in `start'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.2.0/lib/rails/generators.rb:276:in `invoke'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.2.0/lib/rails/commands/generate/generate_command.rb:26: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-5.2.0/lib/rails/command/base.rb:65:in `perform'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.2.0/lib/rails/command.rb:46:in `invoke'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.2.0/lib/rails/commands.rb:18:in `<top (required)>'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:283:in `block in require'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:249:in `load_dependency'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:283:in `require'
        from bin/rails:4:in `<main>'
PS C:\pg\RAILS\devise> rails d scaffold Hashmodel title:string content:text

PS C:\pg\RAILS\devise> rails generate scaffold Hashmodel title:string content:text
      invoke  active_record
      create    db/migrate/20180707033046_create_hashmodels.rb
      create    app/models/hashmodel.rb
      invoke    test_unit
      create      test/models/hashmodel_test.rb
      create      test/fixtures/hashmodels.yml
      invoke  resource_route
       route    resources :hashmodels
      invoke  scaffold_controller
      create    app/controllers/hashmodels_controller.rb
      invoke    erb
       exist      app/views/hashmodels
C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/actions/create_file.rb:63:in `initialize': Permission denied @ rb_sysopen - C:/pg/RAILS/devise/app/views/hashmodels/index.html.erb (Errno::EACCES)
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/actions/create_file.rb:63:in `open'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/actions/create_file.rb:63:in `block in invoke!'
...
PS C:\pg\RAILS\devise>

Answer 1

コマンドプロンプトを実行する際、管理者として実行したことがあったのではないでしょうか。
その場合、管理者ではないユーザ権限で同じファイルを変更しようとするとこのエラーが出るのではないかと思われます(/app/views/hashmodels/index.html.erb以外のファイルについては、identicalとあるので、たまたま同じ内容で書き換えが行われなかったのでエラーになっていない可能性があります)。

一度、管理者権限でプロジェクト全体を削除してから作り直すか、このプロジェクトについては管理者権限で作ることにするかするのはいかがでしょうか。