Noob to Ruby here...any thoughts on why gem_original_require is screwing me up? Thanks for the cool looking tool!

/usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require': no such file to load -- json (LoadError) from /usr/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:36:in `require' from /var/lib/gems/1.8/gems/scout_realtime-1.0.1/lib/scout_realtime.rb:23 from /var/lib/gems/1.8/gems/scout_realtime-1.0.1/bin/scout_realtime:4:in `load' from /var/lib/gems/1.8/gems/scout_realtime-1.0.1/bin/scout_realtime:4 from /usr/local/bin/scout_realtime:19:in `load' from /usr/local/bin/scout_realtime:19