Restart apache error

I tried to restart apache, but got this error message. How can I fix this?
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bitnami@ip-10-146-10-73:~$ sudo /etc/init.d/apache2 restart

• Restarting web server apache2
  apache2: Could not reliably determine the server’s fully qualified domain name, using 127.0.0.1 for ServerName
  apache2: Could not reliably determine the server’s fully qualified domain name, using 127.0.0.1 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
  …fail!

Hi,

It seems that you have another Apache server running at 80 port or another application that is using this port. You can change this port, take a look at http://wiki.bitnami.com/Components/Apache