"X509 Duplicate extensions not allowed" when running logstash with elasticsearch_http

I'm running logstash like it saids in the starting page:

java -jar logstash-1.2.1-flatjar.jar agent --config logstash-dev.conf
With logstash-dev.conf like this:

input {
file {
path => ["/tmp/catalina.jsonevent.log"]
codec => json {
charset => "UTF-8"
}
}
}

output {

1. Use stdout in debug mode again to see what logstash makes of the event.
   stdout {
   debug => true
   }
   elasticsearch_http {
   host => "127.0.0.1"
   }
   }
   And it jumps with this error:

Exception in thread "LogStash::Runner" org.jruby.exceptions.RaiseException: (StoreError) loading file failed: problem creating X509 Aux certificate: java.io.IOException: problem parsing cert: java.security.cert.CertificateParsingException: java.io.IOException: Duplicate extensions not allowed
at org.jruby.ext.openssl.X509Store.add_file(org/jruby/ext/openssl/X509Store.java:151)
at RUBY.initialize(file:/usr/local/bin/logstash/logstash-1.2.1-flatjar.jar!/ftw/agent.rb:70)
at RUBY.register(file:/usr/local/bin/logstash/logstash-1.2.1-flatjar.jar!/logstash/outputs/elasticsearch_http.rb:46)
at org.jruby.RubyArray.each(org/jruby/RubyArray.java:1617)
at RUBY.outputworker(file:/usr/local/bin/logstash/logstash-1.2.1-flatjar.jar!/logstash/pipeline.rb:208)
at RUBY.start_outputs(file:/usr/local/bin/logstash/logstash-1.2.1-flatjar.jar!/logstash/pipeline.rb:140)
I've looking everywhere (google, mail groups of logstash and jruby, and the same with their ircs) but I don't find a way to solve this. I only see similar stacktraces but no solution.

Can you give me any pointer in address this?

thanks in advance