[root@pprd-db-manager1 ~]# ruby -e ' require "puppet" '
/usr/lib/ruby/site_ruby/1.8/puppet/module.rb:3:in `require': no such file to load -- json (LoadError)
        from /usr/lib/ruby/site_ruby/1.8/puppet/module.rb:3
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser/files.rb:1:in `require'
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser/files.rb:1
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser/templatewrapper.rb:1:in `require'
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser/templatewrapper.rb:1
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser/scope.rb:6:in `require'
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser/scope.rb:6
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser/methods.rb:2:in `require'
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser/methods.rb:2
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/method_call.rb:2:in `require'
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser/ast/method_call.rb:2
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser/ast.rb:115:in `require'
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser/ast.rb:115
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser/parser.rb:11:in `require'
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser/parser.rb:11
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser.rb:4:in `require'
        from /usr/lib/ruby/site_ruby/1.8/puppet/parser.rb:4
        from /usr/lib/ruby/site_ruby/1.8/puppet.rb:260:in `require'
        from /usr/lib/ruby/site_ruby/1.8/puppet.rb:260
        from -e:1:in `require'
        from -e:1