AutoSSL error emails

I am still new to this VPS stuff and recently have been getting a bunch of AUTOSSL error emails. I switched my domains from a shared server a while back to a VPS and am trying to learn as fast as I can... Anyhow, I pay for a total of one SSL certificate for my main domain and the other 7 or 8 sub-domains never used an SSL certificate as far as I know. I recently closed down 3 of my sub-domains too and am getting error emails for them too. My paid SSL has renewed properly last week when it cam due and I paid the renewal. Here is a sub-domain message that I got yesterday: [QUOTE] The system failed to create the directory "/home/mydomain/public_html/mysubdomain/.well-known" because of an error: Permission denied
Do I need to worry about this?? Is the FREE AUTOSSL certificate necessary and I had them all along on a shared server?? This particular domain is under construction due to hackers messing with Joomla so I am rebuilding with HTML5 and CSS etc. Thanks, NARS