error uploading

I uploaded my files to my web server and am receiving the following error message on all of my web pages. Everything else is working fine. Is there some way to turn off these error messages?

Warning: session_start() [function.session-start]: open(/tmp/sess_e72f75e9eb25a167af6d089701c2ad8d, O_RDWR) failed: Permission denied (13) in /home/thevegas/public_html/index.php on line 18

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/thevegas/public_html/index.php:18) in /home/thevegas/public_html/index.php on line 18

Warning: Cannot modify header information - headers already sent by (output started at /home/thevegas/public_html/index.php:18) in /home/thevegas/public_html/index.php on line 20

My web site is www.the-vegas-guy.com

--Dan--