Getting admin login error

Hi,
Im getting this kind of error admin login the error details below,
http://ezeeats.com/admin/
Notice: Constant HTTP_SERVER already defined in /home/ezeeatsadmin/public_html/admin/config.php on line 12

How to resolve the issues..

Regards,
Prabakaran.M

Take a look at your /admin/config.php file. It should have two lines for HTTP_SERVER, and you should remove one of them.