in ruby 4.0, rubygems is not working.

[vgpal22]

In ruby 4.0, rubygems is not working.
gem -v => 4.0.3

require 'ostruct' is giving error (unable to find)

gem list or gem install are giving the following error:
ERROR: Loading command: list (NameError)
uninitialized constant Gem::Commands::ListCommand
D:/Progs/Ruby4/lib/ruby/4.0.0/rubygems/command_manager.rb:240:in 'Module#const_get'
D:/Progs/Ruby4/lib/ruby/4.0.0/rubygems/command_manager.rb:240:in 'Gem::CommandManager#load_and_instantiate'
D:/Progs/Ruby4/lib/ruby/4.0.0/rubygems/command_manager.rb:137:in 'Gem::CommandManager#[]'
D:/Progs/Ruby4/lib/ruby/4.0.0/rubygems/command_manager.rb:209:in 'Gem::CommandManager#find_command'
D:/Progs/Ruby4/lib/ruby/4.0.0/rubygems/command_manager.rb:249:in 'Gem::CommandManager#invoke_command'
D:/Progs/Ruby4/lib/ruby/4.0.0/rubygems/command_manager.rb:193:in 'Gem::CommandManager#process_args'
D:/Progs/Ruby4/lib/ruby/4.0.0/rubygems/command_manager.rb:151:in 'Gem::CommandManager#run'
D:/Progs/Ruby4/lib/ruby/4.0.0/rubygems/gem_runner.rb:56:in 'Gem::GemRunner#run'
D:/Progs/Ruby4/bin/gem.cmd:20:in '

'