I upgraded my zen cart 1.3.9d to h by transfering the updated files, but neglected to notice that I had my admin file open. Now when I try to logon to the admin I get http 500 error. In looking at the cache file I get the folling error

PHP Fatal error: Cannot redeclare _sess_open() (previously declared in C:\Inetpub\american-mustang_com\catalog\includes\functions\sessions.php:26) in C:\Inetpub\american-mustang_com\catalog\includes\functions\sessions.php on line 26

Iv'e cleared my cookies and cache
any help welcome

Andy
php 5
mySQL 5.1.48
server 2003