Error when installing logstash plugin

Hi, I'm trying to install some logstash plugin but got errors.

logstash-6.6.0> bin/logstash-plugin install logstash-output-exec-3.1.4.gem
LoadError: load error: jopenssl/load -- java.lang.VerifyError: class org.bouncycastle.asn1.ASN1Primitive overrides final method equals.(Ljava/lang/Object;)Z
require at org/jruby/

Please help, thanks.

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