start apache server I received an error

1) From command line type hostname to get your hostname. Example output might be example.com

2) Edit /etc/hosts and change the lines to match your hostname. Example:

127.0.0.1       localhost.localdomain   localhost.localdomain   localhost4

::1     localhost.localdomain   localhost.localdomain   localhost6

# smartflex

192.168.1.30    smartflex.co.kr

3) Open your httpd.conf file and make sure ServerName is defined. If it is not add ServerName example.com

4) Restart apache via command line apachectl -k graceful OR apachectl -k restart