While experimenting with OpenNebula and trying to build a public cloud with the EC2 interface to OpenNebula I encountered the following problem in the code:

[rogierm@cloudtest3 one]$ econe-upload /home/rogierm/test.img
/usr/lib/ruby/1.8/rdoc/ri/ri_options.rb:53: uninitialized constant RI::Paths (NameError)
from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
from /usr/lib/ruby/1.8/rdoc/usage.rb:72
from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
from /usr/local/one/bin/econe-upload:61


I fixed this problem by adding the following line (above the other require statements) in econe-upload, or any other command giving the same error:

require 'rdoc/ri/ri_paths'