`gem install <package>` 404 Not Found, Error: Gem::RemoteFetcher::FetchError - ruby-on-rails

Question

I'm having a difficulty with RubyGem.
Environment
Windows 64-bit
Using Git-Bash in VSCode
Ruby 3.2.0 + devkit installed from rubyinstaller.org
Problem
run gem install bundler provides this error message:
$ gem install bundler -V
HEAD https://index.rubygems.org/
200 OK
GET https://index.rubygems.org/info/Kim/.local/share/gem/ruby/3.2.0
404 Not Found
ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError)
bad response Not Found 404 (https://index.rubygems.org/info/Kim/.local/share/gem/ruby/3.2.0)
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/remote_fetcher.rb:232:in `fetch_http'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/remote_fetcher.rb:248:in `fetch_path'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/resolver/api_set.rb:105:in `versions'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/resolver/api_set.rb:56:in `find_all'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/resolver/composed_set.rb:54:in `block in find_all'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/resolver/composed_set.rb:53:in `map'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/resolver/composed_set.rb:53:in `find_all'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/resolver/best_set.rb:30:in `find_all'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/resolver/installer_set.rb:170:in `find_all'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/resolver/installer_set.rb:61:in `add_always_install'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/dependency_installer.rb:322:in `resolve_dependencies'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/commands/install_command.rb:201:in `install_gem'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/commands/install_command.rb:226:in `block in install_gems'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/commands/install_command.rb:219:in `each'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/commands/install_command.rb:219:in `install_gems'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/commands/install_command.rb:167:in `execute'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/command.rb:323:in `invoke_with_build_args'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/command_manager.rb:185:in `process_args'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/command_manager.rb:149:in `run'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/gem_runner.rb:51:in `run'
C:/Ruby31-x64/bin/gem:21:in `<main>'
run gem env provides this error message:
$ gem env
ERROR: While executing gem ... (Gem::CommandLineError)
Unknown environment option [Kim/.local/share/gem/ruby/3.2.0]
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/commands/environment_command.rb:93:in `execute'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/command.rb:323:in `invoke_with_build_args'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/command_manager.rb:185:in `process_args'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/command_manager.rb:149:in `run'
C:/Ruby31-x64/lib/ruby/3.1.0/rubygems/gem_runner.rb:51:in `run'
What could be the cause of this problem?
What steps can I follow to solve this issue?
Thanks.

Answer 1

These lines indicate that your shell environment is misconfigured:
GET https://index.rubygems.org/info/Kim/.local/share/gem/ruby/3.2.0
404 Not Found
ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError)
bad response Not Found 404 (https://index.rubygems.org/info/Kim/.local/share/gem/ruby/3.2.0)
You should instead see this:
HEAD https://index.rubygems.org/
200 OK
GET https://index.rubygems.org/info/bundler
200 OK
This line also indicates a misconfiguration:
Unknown environment option [Kim/.local/share/gem/ruby/3.2.0]
This is most likely caused by the gemrc or .gemrc file having incorrect contents. The location of this file on Windows varies so I would recommend looking in the following locations for it:
%USERPROFILE% (typically C:\Users\<your username>
C:\ProgramData
C:\Ruby31-x64
If you can't find the file in any of those locations then perform a search of C:\ to find it.
Once you've found it you can either edit the file to remove the invalid values or you can delete it entirely. (or more preferably, rename it so that you can restore it if necessary)