Logstash netflow plugin configuration error

Hello,

I'm new with logstash, so excuse me if this problem is very simple to fix, unfortunately I couldn't figure out why this is happening.

I'm trying to use logstash to collect traffic information from ESXi using the netflow plugin.

I've created this config file:

input {
udp {
port => 9995
codec => netflow {
netflow_definitions => "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-codec-netflow-2.1.1/lib/logstash/codecs/netflow/ipfix.yaml"
versions => [10]
target => ipfix
}
}
}

output {
stdout { codec => rubydebug }
elasticsearch {
index => "logstash_netflow5-%{+YYYY.MM.dd}"
host => "localhost"
}
}

but when I execute:

logstash -f logstash-staticfile-netflow.conf

I got the following:

Pipeline aborted due to error {:exception=>"LogStash::ConfigurationError", :backtrace=>["/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.4.0-java/lib/logstash/config/mixin.rb:88:in config_init'", "org/jruby/RubyHash.java:1342:ineach'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.4.0-java/lib/logstash/config/mixin.rb:72:in config_init'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.4.0-java/lib/logstash/outputs/base.rb:79:ininitialize'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.4.0-java/lib/logstash/output_delegator.rb:74:in register'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.4.0-java/lib/logstash/pipeline.rb:181:instart_workers'", "org/jruby/RubyArray.java:1613:in each'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.4.0-java/lib/logstash/pipeline.rb:181:instart_workers'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.4.0-java/lib/logstash/pipeline.rb:136:in run'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-2.4.0-java/lib/logstash/agent.rb:491:instart_pipeline'"], :level=>:error}
No matching template for flow id 256 {:level=>:warn}
stopping pipeline {:id=>"main"}

Do you have any idea why I have this error? Thanks in advance for any help!

host => "localhost"

hosts => ["localhost"]