Incorrect validation certificate for TLS-SNI-01 challenge

Hi,

I'm a Linux beginner and started to use Let's Encrypt, because my previous SAN-certificate outdated. It seems, that I need a little help please..

My domain is:
www.sauerbrei.systems

I ran this command:
sudo ./certbot-auto --apache

It produced this output:

Domain: www.sauerbrei.systems
Type: unauthorized
Detail: Incorrect validation certificate for TLS-SNI-01 challenge.
Requested
bd0d5750180d088faf2efa8456d3f9aa.cd79cec95b062c2bb9002b04f2cdba61.acme.invalid
from 80.139.47.163:443. Received certificate containing
'sauerbrei.systems, admin.sauerbrei.systems, db.sauerbrei.systems,
test.sauerbrei.systems, www.sauerbrei.systems'

Domain: sauerbrei.systems
Type: unauthorized
Detail: Incorrect validation certificate for TLS-SNI-01 challenge.
Requested
cd58559cdc2bd8333346f19ffa5b90e1.cc53b43cb497eff377e70fdef9a451de.acme.invalid
from 80.139.47.163:443. Received certificate containing
'sauerbrei.systems, admin.sauerbrei.systems, db.sauerbrei.systems,
test.sauerbrei.systems, www.sauerbrei.systems'

My operating system is (include version):

Linux version 4.4.14-v7+ (dc4@dc4-XPS13-9333) (gcc version 4.9.3 (crosstool-NG crosstool-ng-1.22.0-88-g8460611) ) #895 SMP Sun Jun 26 13:59:02 BST 2016

PRETTY_NAME="Raspbian GNU/Linux 7 (wheezy)"
NAME="Raspbian GNU/Linux"
VERSION_ID="7"
VERSION="7 (wheezy)"
ID=raspbian
ID_LIKE=debian
ANSI_COLOR="1;31"
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="RaspbianBugs - Raspbian"

My web server is (include version):

Server version: Apache/2.2.22 (Debian)
Server built: Aug 18 2015 16:29:10

My hosting provider, if applicable, is:
inwx.org for Domain. Server selfhosted

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

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