[javito]

Hello all, when I tried to run sudo gem install markaby I get this error
developer tools installed and rubygems installed using macports, any idea? Many thanks

/opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require': no such file to load -- sources (LoadError)
from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:27:in `require'
from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/source_info_cache.rb:6
from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:27:in `require'
from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/remote_installer.rb:12
from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:27:in `require'
from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems.rb:112:in `manage_gems'
from /opt/local/bin/gem:10