SSL cert setup for Wiki on OS X Server

@schoen So, the dry run .sh file seems to be working.

server:~ administrator$ cd /Users/administrator/letsencrypt/my_script
server:my_script administrator$ ~/letsencrypt/my_script/
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for
Using the webroot path /Library/Server/Web/Data/Sites/Default for all unmatched domains.
Waiting for verification...
Cleaning up challenges
Unable to clean up challenge directory /Library/Server/Web/Data/Sites/Default/.well-known/acme-challenge
 - The dry run was successful. 

I see that "Unable to clean..." statement every time I run either .sh file. Should I be concerned about that?