Detail: Error creating new order :: Cannot issue for “www.zois.system”: Domain name does not end with a valid public suffix (TLD) (and 1 more problems. Refer to sub-problems for more information.)
name "zois.system" is private, public suffix is not defined
Info: Creating a Letsencrypt certificate with that domain name isn't possible. To create a certificate you need a registered, worldwide unique domain name that ends with a public suffix (.com, .net, .de ...). You have to proof that you are the domain owner.
You must use a domain name with a public suffix like com, net, de, eu, etc. Labels like system, local etc. are not allowed.
PS: Do you want to create a certificate with zois.system or zois.systems? The systems is defined and visible.