You have issued 5 certificates for the same domains
www.sinekt.ru in last 7 days:
CRT ID CERT TYPE DOMAIN (CN) VALID FROM VALID TO EXPIRES IN SANs
529224880 Pre cert sinekt.ru 2018-Jun-15 11:00 UTC 2018-Sep-13 11:00 UTC 89 days sinekt.ru
529204215 Pre cert sinekt.ru 2018-Jun-15 10:36 UTC 2018-Sep-13 10:36 UTC 89 days sinekt.ru
529163812 Pre cert sinekt.ru 2018-Jun-15 10:24 UTC 2018-Sep-13 10:24 UTC 89 days sinekt.ru
528808492 Pre cert sinekt.ru 2018-Jun-15 08:31 UTC 2018-Sep-13 08:31 UTC 89 days sinekt.ru
528465034 Pre cert sinekt.ru 2018-Jun-15 11:05 UTC 2018-Sep-13 11:05 UTC 89 days sinekt.ru
So you have reached this limit (more info about rate limits here https://letsencrypt.org/docs/rate-limits/ ):
We also have a Duplicate Certificate limit of 5 certificates per week. A certificate is considered a duplicate of an earlier certificate if they contain the exact same set of hostnames, ignoring capitalization and ordering of hostnames. For instance, if you requested a certificate for the names [www.example.com, example.com], you could request four more certificates for [www.example.com, example.com] during the week. If you changed the set of names by adding [blog.example.com], you would be able to request additional certificates.
There is no way to override this limit so if you want to issue a new certificate for the same exact set of domains
www.sinekt.ru you will need to wait till next Friday
2018-Jun-22 09:32:00 UTC. Or you could include a new domain or subdomain to the request, something like
blog.sinekt.ru so the 5 duplicated certs per 7 days rate limit won’t apply to the request, but keep in mind there is another rate limit, 20 certificates per 7 days and you have already issued 9 certs for your domain in last 7 days.
The other option is to use one of the 5 certificates you have already issued… why are you trying to issue the same certificate once and again?