Upgrade from php4 to php5 Admin problem

[miles]

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?

[FatGuyinAZ]

Zen Cart 1.3.5 does not work with PHP5. You will need to upgrade Zen Cart or downgrade to PHP4.

[miles]

How about ZenCart v1.3.8a?
Does it works with PHP4?

Because I just installed v1.3.8 and I can't login into the Admin page.

[FatGuyinAZ]

Yes, 1.3.8a works with PHP4. However, once version 1.4 is released, PHP5 will be required.