Mi da questo errore strano:
Notice: Undefined index: DOCUMENT_ROOT in D:\Inetpub\webs\manuliait\plaincart\library\config .php on line 33

Warning: Cannot modify header information - headers already sent by (output started at D:\Inetpub\webs\manuliait\plaincart\library\config .php:33) in D:\Inetpub\webs\manuliait\plaincart\admin\library\ functions.php on line 12
alla riga:
Codice PHP:
$docRoot = $_SERVER['DOCUMENT_ROOT']; 
Cos'è che sbaglio?