Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
I ran this command: Domain hosting edit, ssl support, select Lets Encrypt Support after select click save, after click save show error LE lscplus.com Validation
It produced this output: LE lscplus.com Validation
My web server is (include version): Cloud Server
The operating system my web server runs on is (include version): Ubuntu 16.04
Unfortunately for you, that is a very useless error message .
I have checked your rate limits using lectl and the most likely reason that you cannot issue a certificate is because you issued so many already in the last week.
Sorry, you can't issue any certificate, you already issued 20 certificates on last 7 days
You could issue next certificate on Monday 2018-Feb-12 07:57:00 AEDT
As you see in that output, you won't be able to issue a Let's Encrypt certificate for this domain until at least after this weekend.
Try again in 10 minutes. Let’s Encrypt always issues a certificate with date - 1 hour to avoid conflicts with misconfigured clocks but the rate limit counts from the real date when the cert was issued. lectl script only checks the date your certificate is valid from so add 1 hour to that time, in your case, you should be able to issue a cert at 2018-Feb-11 20:56 UTC (as I said, in aprox 10 minutes).
Edit:
I’ve checked again the certificates you have issued and as I said, now you should be able to issue 1 new cert BUT maybe you are reaching other rate limit (5 duplicated certs per 7 days). In last 7 days you issued 5 certificates covering lscplus.com:
CRT ID DOMAIN (CN) VALID FROM VALID TO EXPIRES IN SANs
325666799 lscplus.com 2018-Feb-08 14:10 UTC 2018-May-09 14:10 UTC 86 days lscplus.com
325534210 lscplus.com 2018-Feb-08 09:52 UTC 2018-May-09 09:52 UTC 86 days lscplus.com
325524125 lscplus.com 2018-Feb-08 09:29 UTC 2018-May-09 09:29 UTC 86 days lscplus.com
325501997 lscplus.com 2018-Feb-08 08:41 UTC 2018-May-09 08:41 UTC 86 days lscplus.com
325481031 lscplus.com 2018-Feb-08 07:53 UTC 2018-May-09 07:53 UTC 86 days lscplus.com
and 5 certificates covering lscplus.com and www.lscplus.com:
CRT ID DOMAIN (CN) VALID FROM VALID TO EXPIRES IN SANs
325503266 lscplus.com 2018-Feb-08 08:43 UTC 2018-May-09 08:43 UTC 86 days lscplus.com
www.lscplus.com
325477738 lscplus.com 2018-Feb-08 07:47 UTC 2018-May-09 07:47 UTC 86 days lscplus.com
www.lscplus.com
325441978 lscplus.com 2018-Feb-08 06:32 UTC 2018-May-09 06:32 UTC 86 days lscplus.com
www.lscplus.com
323931839 lscplus.com 2018-Feb-06 10:15 UTC 2018-May-07 10:15 UTC 84 days lscplus.com
www.lscplus.com
323867093 lscplus.com 2018-Feb-06 08:16 UTC 2018-May-07 08:16 UTC 84 days lscplus.com
www.lscplus.com
So if you want to issue a cert covering only lscplus.com you can’t till aprox. 2018-Feb-15 08:53 UTC and if you want a cert covering lscplus.com and www.lscplus.com you can’t till aprox. 2018-Feb-13 09:16 UTC.