I am getting this error everytime I try to restart my apache server. i have a dedicated server for my wallpaper website and im able to login to my fedora/redhat server through my ssh shell, but i get this when i try to restart my server for some reason i can't figure and my wallpaper website is down. this is what i get when i execute the commnad:

Starting httpd: httpd: Could not determine the server's fully qualified domain name, using for ServerName

how can i fix this?