error log and session in PHP

[Aditya Herlambang]

I am getting the following error log:
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" while reading upstream, client: 70.176.18.156, server: localhost, request: "POST /phpMyAdmin/setup/index.php?page=form&formset=main_frame HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "50.56.81.42", referrer: "http://50.56.81.42/phpMyAdmin/setup/index.php?page=form&formset=main_frame"2011/02/27 16:19:03 [error] 22892#0: *56 FastCGI sent in stderr: "PHP Warning:  Unknown: open(/var/lib/php/session/sess_1om2jb4klr65bfotepo0j7214cvrj2b2, O_RDWR) failed: Permission denied (13) in Unknown on line 0
How can I fix this?? 		 	   		  
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