Problem with certificate creation

My domain is: www.kamieniarstwo-kamar.pl

I ran this command: sudo certbot --apache -d www.kamieniarstwo-kamar.pl

It produced this output:

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Starting new HTTPS connection (1): acme-v01.api.letsencrypt.org
Obtaining a new certificate
Performing the following challenges:
Client with the currently selected authenticator does not support any combination of challenges that will satisfy the CA.
Client with the currently selected authenticator does not support any combination of challenges that will satisfy the CA.

My web server is (include version):

root@kamar:/opt/letsencrypt# apachectl -V
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 188.116.7.84. Set the 'ServerName' directive globally to suppress this message
Server version: Apache/2.4.10 (Debian)
Server built:   Mar 31 2018 09:39:03
Server's Module Magic Number: 20120211:37
Server loaded:  APR 1.5.1, APR-UTIL 1.5.4
Compiled using: APR 1.5.1, APR-UTIL 1.5.4
Architecture:   64-bit
Server MPM:     event
  threaded:     yes (fixed thread count)
    forked:     yes (variable process count)
Server compiled with....
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=256
 -D HTTPD_ROOT="/etc/apache2"
 -D SUEXEC_BIN="/usr/lib/apache2/suexec"
 -D DEFAULT_PIDLOG="/var/run/apache2.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="mime.types"
 -D SERVER_CONFIG_FILE="apache2.conf"

The operating system my web server runs on is (include version):

Linux kamar 2.6.32-042stab125.3 #1 SMP Wed Sep 27 19:27:11 MSK 2017 x86_64 GNU/Linux
Debian 8.0 x86_64 minimal

My hosting provider, if applicable, is: hitme.pl

I can login to a root shell on my machine (yes or no, or I don't know): yes

I'm using a control panel to manage my site (no, or provide the name and version of the control panel): no

Please see

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