Plugin WMI : exception=>"NoMethodError"

Hey guys,

i try to exec this logstash conf :

input {
wmi {
query => "select * from Win32_PerfFormattedData_PerfOS_Processor"
}
}
output
{
stdout
{
codec => rubydebug
}
}

but i have an exception ;

Pipelineabortedduetoerror{
: exception=>"NoMethodError",
: backtrace=>[
"C:/Users/Administrator/Desktop/logstash-2.4.0/vendor/bundle/jruby/1.9/gems/logstash-input-wmi-2.0.5-java/lib/logstash/inputs/wmi.rb:65:in register'", "C:/Users/Administrator/Deskt op/logstash-2.4.0/vendor/bundle/jruby/1.9/gems/logstash-core-2.4.0-java/lib/logstash/pipeline.rb:330:instart_inputs'",
"org/jruby/RubyArray.java:1613:in each'", "C:/Users/Administrator/Desktop/logstash-2.4.0/vendor/bundle/jruby/1.9/gems/logstash-core- 2.4.0-java/lib/logstash/pipeline.rb:329:instart_inputs'",
"C:/Users/Administrator/Desktop/logstash-2.4.0/vendor/bundle/jruby/1.9/gems/logstash-core-2.4.0-java/lib/logstash/pipeline.rb:180:in start_workers'", "C:/Users/Administrator/Desktop/logstash-2. 4.0/vendor/bundle/jruby/1.9/gems/logstash-core-2.4.0-java/lib/logstash/pipeline.rb:136:inrun'",
"C:/Users/Administrator/Desktop/logstash-2.4.0/vendor/bundle/jruby/1.9/gems/logstash-core-2.4.0-java/lib/logstash/agent.rb:491:in `start_pipeline'"
],
: level=>: error
}

someone could help me, please?

I am lost with WMI plugin.

best regards