My b2evolution Version: 2.x

after instalation i put the correct string in admin.php :
require_once ($adminskins_path.$admin_skin.'/_adminUI.class.php')

now i`ve got a new error :

Parse error: syntax error, unexpected T_VARIABLE in /home/***/domains/****.org/public_html/sexy/admin.php on line 169

admin.php look like :
require_once ($adminskins_path.$admin_skin.'/_adminUI.class.php')
/**
* This is the Admin UI object which handles the UI for the backoffice.
*
* @global AdminUI
*/
$AdminUI = & new AdminUI();

/*
* Pass over to controller...
*/

// Get requested controller and memorize it:
param( 'ctrl', '/^[a-z0-9_]+$/', $default_ctrl, true );

help me please !