Logstash netflow 插件配置错误

我正在尝试使用 logstash 使用 netflow 插件从 VMware ESXi 收集流量信息。

我已经在安装了 openjdk 8 的 Ubuntu 16.04.1 上从 www.elastic.co 安装了最新版本的 logstash 和 elasticsearch。

我已经创建了这个配置文件：

input {
    udp {
      host => localhost
      port => 9995
      codec => netflow {
        versions => [10]
        target => ipfix
      }
      type => ipfix
    }
  }

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

但是当我执行时：

logstash -f logstash-staticfile-netflow.conf

我得到以下信息：

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"}

你知道为什么我有这个错误吗？提前感谢您的帮助！