I installed ruby and git for Windows as described in the OpenShift Windows client tools installation guide.
When I run an rhc command, I get this error:
C:/Ruby23/lib/ruby/gems/2.3.0/gems/commander-4.2.1/lib/commander/user_interaction.rb:328: warning: constant ::TimeoutError is deprecated
C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- dl/import (LoadError)
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/net-ssh-2.9.2/lib/net/ssh/authentication/pageant.rb:1:in `<top (required)>'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/net-ssh-2.9.2/lib/net/ssh/authentication/agent/socket.rb:5:in `<top (required)>'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/net-ssh-2.9.2/lib/net/ssh/authentication/agent.rb:22:in `<top (required)>'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/net-ssh-2.9.2/lib/net/ssh/authentication/key_manager.rb:4:in `<top (required)>'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/net-ssh-2.9.2/lib/net/ssh/authentication/session.rb:4:in `<top (required)>'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/net-ssh-2.9.2/lib/net/ssh.rb:11:in `<top (required)>'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/rhc-1.38.4/lib/rhc/ssh_helpers.rb:18:in `<top (required)>'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/rhc-1.38.4/lib/rhc/wizard.rb:77:in `<class:Wizard>'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/rhc-1.38.4/lib/rhc/wizard.rb:7:in `<module:RHC>'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/rhc-1.38.4/lib/rhc/wizard.rb:6:in `<top (required)>'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/rhc-1.38.4/lib/rhc/commands/base.rb:4:in `<top (required)>'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/rhc-1.38.4/lib/rhc/commands/account.rb:2:in `<module:Commands>'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/rhc-1.38.4/lib/rhc/commands/account.rb:1:in `<top (required)>'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in`require'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/rhc-1.38.4/lib/rhc/commands.rb:189:in `block in load'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/rhc-1.38.4/lib/rhc/commands.rb:188:in `each'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/rhc-1.38.4/lib/rhc/commands.rb:188:in `load'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/rhc-1.38.4/lib/rhc/cli.rb:36:in`start'
from C:/Ruby23/lib/ruby/gems/2.3.0/gems/rhc-1.38.4/bin/rhc:20:in `<top (required)>'
from C:/Ruby23/bin/rhc:23:in `load'
from C:/Ruby23/bin/rhc:23:in `<main>'
How can I prevent this error and run the OpenShift rhc tools in Windows?
Try uninstalling the current Ruby version and installing Ruby 1.9.3 for Windows which is known to work with rhc tools on Windows.
EDIT:
As mentioned in comments below, Ruby 2.0 for Windows is known to work as well.
All archived RubyInstaller versions are available here.