error message during installation

[PhreeMason]

Hello I get this error message during installation

ERROR: While executing gem ... (Errno::EINVAL)
Invalid argument @ rb_sysopen - C:/Ruby24/lib/ruby/gems/2.4.0/gems/learn-gen
erate-1.0.16/lib/templates/ios/.liftoff/templates/<%= prefix %>AppDelegate.h

[andrewtrent]

Having the same issue:

PS C:\ruby23> gem install learn-generate --verbose --backtrace HEAD https://api.rubygems.org/api/v1/dependencies 200 OK GET https://api.rubygems.org/api/v1/dependencies?gems=learn-generate 200 OK Getting SRV record failed: DNS result has no information for _rubygems._tcp.api.rubygems.org C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/.gitignore C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/.rspec C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/Gemfile C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/LICENSE.txt C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/README.md C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/Rakefile C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/bin/learn-generate C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/learn-generate.gemspec C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/learn_generate.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/learn_generate/file_finder.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/learn_generate/helpers/dot-learn-helper.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/learn_generate/helpers/gemfile-helper.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/learn_generate/helpers/template-helper.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/learn_generate/ios_lab.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/learn_generate/ios_lab/liftoff_backup.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/learn_generate/template_loader.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/learn_generate/template_maker.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/learn_generate/version.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/activerecord/.gitignore C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/activerecord/.rspec C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/activerecord/CONTRIBUTING.md C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/activerecord/LICENSE.md C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/activerecord/README.md C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/activerecord/Rakefile C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/activerecord/app/models/sample-class.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/activerecord/config/environment.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/activerecord/db/migrations/.keep C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/activerecord/lib/support/connection_adapter.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/activerecord/lib/support/db_registry.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/activerecord/spec/spec_helper.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/command-line/.gitignore C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/command-line/.rspec C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/command-line/CONTRIBUTING.md C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/command-line/LICENSE.md C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/command-line/README.md C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/command-line/bin/runner.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/command-line/lib/environment.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/command-line/lib/lab-name/cli.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/command-line/spec/spec_helper.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/front-end/.gitignore C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/front-end/CONTRIBUTING.md C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/front-end/LICENSE.md C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/front-end/README.md C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/front-end/css/style.css C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/front-end/images/.keep C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/front-end/index.html C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/fundamental-ruby/.gitignore C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/fundamental-ruby/.rspec C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/fundamental-ruby/CONTRIBUTING.md C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/fundamental-ruby/LICENSE.md C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/fundamental-ruby/README.md C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/fundamental-ruby/lib/file.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/fundamental-ruby/spec/spec_helper.rb C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/ios/.liftoff/.liftoffrc C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/ios/.liftoff/templates/.learn ERROR: While executing gem ... (Errno::EINVAL) Invalid argument @ rb_sysopen - C:/Ruby23/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/ios/.liftoff/templates/<%= prefix %>AppDelegate.h C:/Ruby23/lib/ruby/2.3.0/rubygems/package.rb:381:in initialize'
C:/Ruby23/lib/ruby/2.3.0/rubygems/package.rb:381:in open' C:/Ruby23/lib/ruby/2.3.0/rubygems/package.rb:381:in block (2 levels) in extract_tar_gz'
C:/Ruby23/lib/ruby/2.3.0/rubygems/package/tar_reader.rb:65:in each' C:/Ruby23/lib/ruby/2.3.0/rubygems/package.rb:363:in block in extract_tar_gz'
C:/Ruby23/lib/ruby/2.3.0/rubygems/package.rb:457:in block in open_tar_gz' C:/Ruby23/lib/ruby/2.3.0/rubygems/package.rb:454:in wrap'
C:/Ruby23/lib/ruby/2.3.0/rubygems/package.rb:454:in open_tar_gz' C:/Ruby23/lib/ruby/2.3.0/rubygems/package.rb:362:in extract_tar_gz'
C:/Ruby23/lib/ruby/2.3.0/rubygems/package.rb:343:in block (2 levels) in extract_files' C:/Ruby23/lib/ruby/2.3.0/rubygems/package/tar_reader.rb:65:in each'
C:/Ruby23/lib/ruby/2.3.0/rubygems/package.rb:340:in block in extract_files' C:/Ruby23/lib/ruby/2.3.0/rubygems/package/file_source.rb:30:in open'
C:/Ruby23/lib/ruby/2.3.0/rubygems/package/file_source.rb:30:in with_read_io' C:/Ruby23/lib/ruby/2.3.0/rubygems/package.rb:337:in extract_files'
C:/Ruby23/lib/ruby/2.3.0/rubygems/installer.rb:768:in extract_files' C:/Ruby23/lib/ruby/2.3.0/rubygems/installer.rb:295:in install'
C:/Ruby23/lib/ruby/2.3.0/rubygems/resolver/specification.rb:97:in install' C:/Ruby23/lib/ruby/2.3.0/rubygems/request_set.rb:166:in block in install'
C:/Ruby23/lib/ruby/2.3.0/rubygems/request_set.rb:156:in each' C:/Ruby23/lib/ruby/2.3.0/rubygems/request_set.rb:156:in install'
C:/Ruby23/lib/ruby/2.3.0/rubygems/commands/install_command.rb:250:in install_gem' C:/Ruby23/lib/ruby/2.3.0/rubygems/commands/install_command.rb:300:in block in install_gems'
C:/Ruby23/lib/ruby/2.3.0/rubygems/commands/install_command.rb:296:in each' C:/Ruby23/lib/ruby/2.3.0/rubygems/commands/install_command.rb:296:in install_gems'
C:/Ruby23/lib/ruby/2.3.0/rubygems/commands/install_command.rb:203:in execute' C:/Ruby23/lib/ruby/2.3.0/rubygems/command.rb:308:in invoke_with_build_args'
C:/Ruby23/lib/ruby/2.3.0/rubygems/command_manager.rb:169:in process_args' C:/Ruby23/lib/ruby/2.3.0/rubygems/command_manager.rb:139:in run'
C:/Ruby23/lib/ruby/2.3.0/rubygems/gem_runner.rb:55:in run' C:/Ruby23/bin/gem.cmd:29:in

'`

[oli-gra]

Ditto on W10P with Ruby 2.3..3:
ERROR: While executing gem ... (Errno::EINVAL)
Invalid argument @ rb_sysopen - C:/RailsInstaller/Ruby2.3.3/lib/ruby/gems/2.3.0/gems/learn-generate-1.0.16/lib/templates/ios/.liftoff/templates/<%= prefix %>AppDelegate.h

[ebonyash15]

I was also having the same issue with running gem install learn-co.

I partially fixed this by running the command from the gems website gem install learn-co -v 1.0.4, however, when then running learn whoami I get the following error:

C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/learn-co-1.0.4/lib/learn/username_parser.rb:10:in `gets': No such file or directory @ rb_sysopen - whoami (Errno::ENOENT)
        from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/learn-co-1.0.4/lib/learn/username_parser.rb:10:in `gets'
        from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/learn-co-1.0.4/lib/learn/username_parser.rb:10:in `get_username'
        from C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/learn-co-1.0.4/bin/learn:11:in `<top (required)>'
        from C:/Ruby26-x64/bin/learn:23:in `load'
        from C:/Ruby26-x64/bin/learn:23:in `<main>'
Enter your github username:

which basically means they don't bother to check the directory so that's why I'm getting this error :/

[ItzelOrtiz]

git won't install any of the gems but Ubuntu did. However, Ubuntu won't show me the proper file locations when I type ls as git does.