Error: Warning: session_start() [function.session-start]

Hello, guys! I’m getting the following error messages on the top and bottom of my website:

TOP: Warning: session_start() [function.session-start]: open(/var/lib/php-cgi/session/sess_9to5835vgl97bcaojguh6tqj01, O_RDWR) failed: No such file or directory (2) in /home/storage/e/7f/bb/gvbadvocacia1/public_html/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_entries.php on line 32

BOTTOM: Warning: Unknown: open(/var/lib/php-cgi/session/sess_9to5835vgl97bcaojguh6tqj01, O_RDWR) failed: No such file or directory (2) in Unknown on line 0
Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php-cgi/session) in Unknown on line 0

What should I do? Please help.

Thanks!