Anonymous - 2012-07-23

I set a cron job on my Plesk 8.3, and I received this output:

PHP Warning:  Unknown: open(/var/lib/php/session/sess_2frvslsdb0al2rqlogrpic5cj6, O_RDWR) failed: Permission denied (13) in Unknown on line 0
PHP Warning:  Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php/session) in Unknown on line 0

How can I set the system to work?