Cannot redeclare class in PEAR Packages with Zend Debugger

Hello Guys, I want to debug my application using Zend Studio debugger in server mode. When i try to debug a page using Zend Firefox extension (or debug URL in Zend Studio itself) i got an: Cannot redeclare class pear_config in C:\php\PEAR\PEAR\Config.php on line 2052 after disabling this require_once, another error appears: Cannot redeclare class pear_validate in C:\php\PEAR\PEAR\Validate.php on line 46 What is interesting, this configuration works without debugger. Other packages i use (html_quickform, db, mail) seems to work correctly. My configuration: Apache 1.3.33 PHP 5.1.2 (checked also with 5.1.1) Zend Studio Professional 5.1 + Zend Studio Server 5.1 WindowsXP Professional I've tried the solution similar according to this: http://www.zend.com/support/knowledgebase.php?kbid=81&view_only=1 updated all found php.ini files according to this but no effect. Anyone has an idea what's wrong ? -- drooid