Problem:
Error creating new order :: too many certificates (5) already issued for this exact set of domains
Solution
This error means that 5 certificates have already been issued by letsencrypt servers within the last 1 week (168 hours) for your exact domain name and they are refusing to issue more certificates.
This is most likely the result of multiple attempts to install the MediaCP or SSL certificates.
There are some options:
a) Wait 1 week to try again;
b) Install a Custom SSL Certificate;
c) Change the domain name to another name **recommended**