I see a lot of lines listed on the error log in my cpanel Can someone explain what they mean and if its something I need to address, if so how so. Looks like this

This one here is the one I see most and would love to know how to make it go away. lol
[Wed Oct 23 19:45:36 2013] [error] [client 98.20.188.200] File does not exist: /home/cafeflir/public_html/images/AegeanPurple/elements/navtab.png, referer: http://cafe-flirt.com/css.php?stylei...rmcontrols.css, My navtab.png is there so I am not sure about the rest of it.