httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName
(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
Unable to open logs

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this is after I tried the command:
sudo /usr/local/apache2/bin/apachectl -f /usr/local/apache2/conf/httpd.conf
even without sudo, it poses the same message.