"bin/elasticsearch-certutil ca" not working

I am getting following error :

same for:
bin/elasticsearch-certutil cert --ca elastic-stack-ca.p12

I'm just beginner in ES and i want to setup TSL communication in cluster based on:
, however can't generate certificate using above commands.

I'm executing it from: /opt/apps/elasticsearch/6.5.1/elasticsearch-6.5.1/bin$
and the script is there: image
ES is version 6.5.1

Of course i was googling the issue, but could not find any solution.
Thx for any help.

You need execute the command in the parent folder of bin, i.e. in your case, it should be /opt/apps/elasticsearch/6.5.1/elasticsearch-6.5.1.

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