Error while facing logstash startup - No Implicit conversion of nil into String

[main] Logstash - java.lang.IllegalStateException: Logstash stopped processing because of an error: (TypeError) no implicit conversion of nil into String.

Logstash went shutdown suddenly due to VM shutdown . When we try to restart the ELK stacks , we are facing this issue in logstash .

Please share the logs.

This issue is solved , actually there was some APM agent(of Riverbed monitoring ) running in the same VM. Looks like it was locking the pid file or any process id , due to which logstash was not getting started .

On stopping the agent and uninstalling it , logstash worked fine .
logstash should log proper error messages.

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