admin panel problem after installing

[jumpinjack]

hi

i have just upgraded my forum from 1.2.12 everything went fine but when i go to enter the admin cp i get the following error

Fatal error: Cannot redeclare is_super_admin() (previously declared in /home/g03vood/public_html/forum/inc/functions.php:5206) in /home/g03vood/public_html/forum/admin/adminfunctions.php on line 2425

can someone please tell me how to get round this

many thanks