Apache won't start after installing SSL certificate

Hi guys,

I am using CentOS 7 and running Apache/2.4.6. When I installed an SSL certificate for one of the virtual servers and tried to restart Apache, I got the following error:

# service httpd restart
Redirecting to /bin/systemctl restart httpd.service
Job for httpd.service failed because the control process exited with error code. See "systemctl status httpd.service" and "journalctl -xe" for details.

Running the status command gives the following output:

# systemctl status httpd.service -l
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Fri 2017-10-06 11:06:01 CEST; 40s ago
     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 13387 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=1/FAILURE)
  Process: 13385 ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND (code=exited, status=1/FAILURE)
 Main PID: 13385 (code=exited, status=1/FAILURE)

Oct 06 11:06:01 server.3pdevelopment.info systemd[1]: Starting The Apache HTTP Server...
Oct 06 11:06:01 server.3pdevelopment.info httpd[13385]: [Fri Oct 06 11:06:01.011935 2017] [so:warn] [pid 13385] AH01574: module rewrite_module is already loaded, skipping
Oct 06 11:06:01 server.3pdevelopment.info systemd[1]: httpd.service: main process exited, code=exited, status=1/FAILURE
Oct 06 11:06:01 server.3pdevelopment.info kill[13387]: kill: cannot find process ""
Oct 06 11:06:01 server.3pdevelopment.info systemd[1]: httpd.service: control process exited, code=exited status=1
Oct 06 11:06:01 server.3pdevelopment.info systemd[1]: Failed to start The Apache HTTP Server.
Oct 06 11:06:01 server.3pdevelopment.info systemd[1]: Unit httpd.service entered failed state.
Oct 06 11:06:01 server.3pdevelopment.info systemd[1]: httpd.service failed.

And running the journalctl -xn provides the following:

# journalctl -xn
-- Logs begin at Fri 2017-10-06 10:49:08 CEST, end at Fri 2017-10-06 11:07:57 CEST. --
Oct 06 11:07:43 server.3pdevelopment.info sshd[13400]: Failed password for root from 59.45.175.36 port 48556 ssh2
Oct 06 11:07:44 server.3pdevelopment.info sshd[13400]: pam_succeed_if(sshd:auth): requirement "uid >= 1000" not met by user "root"
Oct 06 11:07:46 server.3pdevelopment.info sshd[13400]: Failed password for root from 59.45.175.36 port 48556 ssh2
Oct 06 11:07:46 server.3pdevelopment.info sshd[13400]: pam_succeed_if(sshd:auth): requirement "uid >= 1000" not met by user "root"
Oct 06 11:07:48 server.3pdevelopment.info sshd[13400]: Failed password for root from 59.45.175.36 port 48556 ssh2
Oct 06 11:07:51 server.3pdevelopment.info sshd[13400]: Received disconnect from 59.45.175.36 port 48556:11:  [preauth]
Oct 06 11:07:51 server.3pdevelopment.info sshd[13400]: Disconnected from 59.45.175.36 port 48556 [preauth]
Oct 06 11:07:51 server.3pdevelopment.info sshd[13400]: PAM 2 more authentication failures; logname= uid=0 euid=0 tty=ssh ruser= rhost=59.45.175.36  user=root
Oct 06 11:07:57 server.3pdevelopment.info sshd[13402]: Received disconnect from 121.18.238.106 port 47931:11:  [preauth]
Oct 06 11:07:57 server.3pdevelopment.info sshd[13402]: Disconnected from 121.18.238.106 port 47931 [preauth]

I am a software developer so this is not my area of expertise, so any help would be greatly appreciated.

Thanks in advance!