I'm currently running zencart v1.3.5.

On my hosting company I tried to upgrade the PHP as the following;
  • PHP4
    All files with the extension .php will be handled by the PHP4 engine.
    This version of PHP will be deprecated soon, and it is suggested to only use it until you can safely migrate your scripts to PHP5. Here is a migration guide to help you upgrade to PHP5
  • PHP5
    All files with the extension .php will be handled by the PHP5 engine.
    Current, most reliable and best performing version of PHP
So i chose to upgrade to from PHP4 to PHP5. Later then when I try to access the store Admin, it comes with an error something like this:


[Admin Login]
Admin Username:
Admin Password:

Fatal error: Call to a member function Execute() on a non-object in /home/mydirect/public_html/includes/functions/sessions.php on line 61
What's the problem and how to fix this?