rspec --init no funciona / `mkd ir ': argumento no válido - ./C: (Errno :: EINVAL)

Estoy siguiendo el código escolarclase en rspec. La instalación funcionó bien. Hice un archivo llamado rspec-zombie para el proyecto. Multa. Pero cuando probé rspec --init en powershell, recibí un mensaje de error impío. Tengo la impresión de que se supone que hay algunos archivos creados dentro del directorio, que no están allí. Sigue.

C:\Users\Roman\The-Odin-Project\rspec-zombie> rspec --init
  create   .rspec
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-support-3.1.0/lib/rspec/support/directory_maker.rb:17:in `mkd
ir': Invalid argument - ./C: (Errno::EINVAL)
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-support-3.1.0/lib/rspec/support/directory_maker.
rb:17:in `block in mkdir_p'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-support-3.1.0/lib/rspec/support/directory_maker.
rb:13:in `each'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-support-3.1.0/lib/rspec/support/directory_maker.
rb:13:in `mkdir_p'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-core-3.1.3/lib/rspec/core/project_initializer.rb
:33:in `copy_template'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-core-3.1.3/lib/rspec/core/project_initializer.rb
:22:in `run'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-core-3.1.3/lib/rspec/core/option_parser.rb:81:in
 `block (2 levels) in parser'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/optparse.rb:1360:in `call'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/optparse.rb:1360:in `block in parse_in_order'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/optparse.rb:1347:in `catch'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/optparse.rb:1347:in `parse_in_order'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/optparse.rb:1341:in `order!'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/optparse.rb:1432:in `permute!'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/optparse.rb:1453:in `parse!'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-core-3.1.3/lib/rspec/core/option_parser.rb:16:in
 `parse'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-core-3.1.3/lib/rspec/core/option_parser.rb:8:in
`parse'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-core-3.1.3/lib/rspec/core/configuration_options.
rb:120:in `command_line_options'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-core-3.1.3/lib/rspec/core/configuration_options.
rb:154:in `custom_options_file'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-core-3.1.3/lib/rspec/core/configuration_options.
rb:112:in `file_options'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-core-3.1.3/lib/rspec/core/configuration_options.
rb:44:in `organize_options'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-core-3.1.3/lib/rspec/core/configuration_options.
rb:14:in `initialize'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-core-3.1.3/lib/rspec/core/runner.rb:58:in `new'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-core-3.1.3/lib/rspec/core/runner.rb:58:in `run'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-core-3.1.3/lib/rspec/core/runner.rb:37:in `invok
e'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rspec-core-3.1.3/exe/rspec:4:in `<top (required)>'
        from C:/RailsInstaller/Ruby1.9.3/bin/rspec:23:in `load'
        from C:/RailsInstaller/Ruby1.9.3/bin/rspec:23:in `<main>'

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