sql_select option missing

Hi there.

I'm running CWP on CentOS 7.5.
I was following a guide to enable memcached. After installing I found out the W3TC keeps memcached option grayed out.
So trying to figure things out, I've ran journalctl -u memcached and got the following errors:

Code: [Select]

... memcached[19225]: sql_select option missing
... memcached[19225]: auxpropfunc error no mechanism available
Any idea what's wrong?