IMPORTANT :

PEAR is not in your include_path, and your include_path could not be changed to include PEAR.
This may be caused by your web hoster (web server configuration).
Please place pear package (found inside phpersistence/lib/pear) to a folder in your include_path!

Your include_path is : /var/www/sda/3/7/www.phpersistence/include:.:/usr/php4.1.3/lib/php

If you cannot put any file into one of these folders, ask your web hosting provider to do so. Then change PEAR_DB_PATH in phpersistence/conf/path.conf.php file to the path where pear was copied.