Installing ror on vps with cpanel

Hi,

I am installing in my vps following the intructions of
http://wiki.rubyonrails.com/rails/pages/HowtoInstallAndRunRubyOnRailsOnCpanel

I installed ruby by shell fine but when i try install gems y obtain this
error

As of RubyGems 0.8.0, library stubs are no longer needed.
Searching $LOAD_PATH for stubs to optionally delete (may take a
while)…
…done.
hook /usr/local/src/rubygems-0.8.11/./post-install.rb failed:
wrong # of arguments(2 for 1)
Try ‘ruby setup.rb --help’ for detailed usage.

Please help me

Anybody can help me