Logstash Periodicpoller Exception

I am getting periodicpoller exception in logstash command propmt. Please suggest me some solution for it.
[2017-07-21T22:15:03,650][ERROR][logstash.instrument.periodicpoller.jvm] Periodi
cPoller: exception {:poller=>#<LogStash::Instrument::PeriodicPoller::JVM:0x7ea3b
49f @task=#<Concurrent::TimerTask:0x4932dfe1 @observers=#<Concurrent::Collection
::CopyOnNotifyObserverSet:0x8d1bcf7 @observers={#<LogStash::Instrument::Periodic
Poller::JVM:0x7ea3b49f ...>=>:update}>

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