Session Alert

I’ve lately gotten this warning when I delete the access log contents:

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/bethisra/public_html/wp-content/plugins/simple-security/simple-security-access-log.php:388) in /home/bethisra/public_html/wp-content/plugins/youtube-simplegallery/youtube_simplegallery.php on line 137

Before I go to the Youtube Simple Gallery author, is there anything you might add that would assist in identifying the problem?

https://www.ads-software.com/extend/plugins/simple-security/