Where's the debug tool of PHP Designer 2007-Personal?

[evaNonsense]

Hi All,

This is my very first post in the forum so please bear with me.

I was using Eclipse as my IDE before. However, since it only slows down my PC, I decided to use PHP Designer 2007-Personal instead. Unlike other IDEs, PHP Designer Personal is light and very nimble. Unfortunately, when I clicked on Debug tab to (of course) debug my codes, I encountered this error message:

Zend Optimizer requires Zend Engine API version 220051025. The Zend Engine API version 220060519 which is installed, is newer. Contact Zend Technologies at http://www.zend.com/ for a later version of Zend Optimizer.

Has anybody encountered the same error message? Isn't debug tool included in the Personal package of PHP Designer 2007?

I am using PHP ver. 5.1.2, while my Zend Optimizer is ver. 2.6.2

Thanks!