Warning: session_start() [function.session-start]: – HELP ASAP PLEASE!!

Greetings wonderful team support.
I have two wordpress installs one in the root and the other in the subdirectory. This is not a multisite, they use two separate DB’s. After trying to resolve the issue between making them both work separately, I have been given a suggestion to switch to LINUX from windows hosting. I did and it seems that the subdirectory WordPress stopped pulling information from the root database but I’m getting the following errors if you simply visit the http://www.artemrepin.com. If you type in http://artemrepin.com without the www you will see the site but the errors are still being reported around it. I have www taken out in wordpress before, as I thought about doing the Multisite, and that was the suggestion.
Please help ASAP

Thank you.

Warning: session_start() [function.session-start]: open(/home/content/37/9998537/tmp/sess_pmbuebuoirvfvp10md5r7abua7, O_RDWR) failed: No such file or directory (2) in /home/content/37/9998537/html/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_entries.php on line 32

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/content/37/9998537/html/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_entries.php:32) in /home/content/37/9998537/html/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_entries.php on line 32

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/content/37/9998537/html/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_entries.php:32) in /home/content/37/9998537/html/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_entries.php on line 32

Warning: Cannot modify header information - headers already sent by (output started at /home/content/37/9998537/html/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_entries.php:32) in /home/content/37/9998537/html/wp-includes/pluggable.php on line 1173

Warning: Unknown: open(/home/content/37/9998537/tmp/sess_pmbuebuoirvfvp10md5r7abua7, 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 () in Unknown on line 0