@GindiKhangura Not sure if your old listed version of Splunk 7.2.6 can support it, hoping you've updated since its unsupported as of April 2021 and this thread is just over a year old at my time of writing. I'm writing because I never saw the appropriate answer added. Since your CSC is a streaming command, you can set a replication whitelist in $SPLUNK_HOME/etc/apps/app_name/default/distsearch.conf to include the required libraries. This will allow your indexers to have a copy, fixing the error, and removing any need for the inappropriate copying of splunklib into the bin directory. https://dev.splunk.com/enterprise/docs/devtools/customsearchcommands/packageanddeploycustom/#Deploy-a-streaming-command-on-an-indexer Happy Holidays and Happy Splunking
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