Ошибка примера документа Logstash — исключение в потоке LogStash::Runner

Я пробую пример из шага 6 из документации: http://logstash.net/docs/1.2.1/tutorials/10-minute-walkthrough/

Когда я запускаю logstash, я получаю:

Using milestone 2 input plugin 'tcp'. This plugin should be stable, but if you see strange behavior, please let us know! For more information on plugin milestones, see http://logstash.net/docs/1.2.1/plugin-milestones {:level=>:warn}
You are using a deprecated config setting "type" set in grok. Deprecated settings will continue to work, but are scheduled for removal from logstash in the future. You can achieve this same behavior with the new conditionals, like: `if [type] == "sometype" { grok { ... } }`. If you have any questions about this, please visit the #logstash channel on freenode irc. {:name=>"type", :plugin=><LogStash::Filters::Grok --->, :level=>:warn}
You are using a deprecated config setting "pattern" set in grok. Deprecated settings will continue to work, but are scheduled for removal from logstash in the future.  If you have any questions about this, please visit the #logstash channel on freenode irc. {:name=>"pattern", :plugin=><LogStash::Filters::Grok --->, :level=>:warn}
You are using a deprecated config setting "type" set in date. Deprecated settings will continue to work, but are scheduled for removal from logstash in the future. You can achieve this same behavior with the new conditionals, like: `if [type] == "sometype" { grok { ... } }`. If you have any questions about this, please visit the #logstash channel on freenode irc. {:name=>"type", :plugin=><LogStash::Filters::Date --->, :level=>:warn}
Invalid gemspec in [file:/home/bumjvr/logstash/logstash-1.2.1-flatjar.jar!/META-INF/jruby.home/lib/ruby/gems/shared/specifications/rake-10.0.3.gemspec]: no such file to load -- rubygems/dependency
Exception in thread "LogStash::Runner" org.jruby.exceptions.RaiseException: (LoadError) no such file to load -- base64
        at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:1054)

Это в Ubuntu 13.04 и logstash 1.2.1.

Любые идеи?! Я не совсем уверен, где даже начать искать!