Moved Servers Now Events+ Is Throwing Errors

I have moved servers (same domain, same file structure)

Upon uploading the database and moving the public_html files, the site is seemingly working.

Except, These errors are displayed at the top of every page. Also, some styles (bg image) are not displaying.

Warning: session_start() [function.session-start]: open(/tmp/sess_648fd185ecf3a572bcd9f8d624e32d59, O_RDWR) failed: Permission denied (13) in /home/rmobc/public_html/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 150

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/rmobc/public_html/wp-content/plugins/events-and-bookings/events-and-bookings.php:150) in /home/rmobc/public_html/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 150

live website is:
RMOBCenter.com

help?