php warnings

I get the following warnings when Easy Foundation Shortcode is activated. This is the only plugin I have activated on a fresh install of WordPress 3.9.

( ! ) Warning: Unknown: open(/var/lib/php/session/sess_piuetv1t90j3nmb161lunp09d7, O_RDWR) failed: Permission denied (13) 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/session) in Unknown on line 0

https://www.ads-software.com/plugins/easy-foundation-shortcodes/