i was using wordpress-automatic-upgrade plugin in wordpress to update my wordpress version.I got the following error: Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home2/thingsf1/public_html/wp-admin/admin-header.php:16) in /home2/thingsf1/public_html/wp-content/plugins/wordpress-automatic-upgrade/wordpress-automatic-upgrade.php and my website is on maintenance mode.can anybody help me to bring it back into normal.
You should have backed up your database beforehand. If you did, just restore your old SQL dump. But, Im willing to bet you didnt
If you are using cookie-based sessions, you must call session_start() before anything is outputted to the browser. Session functions like session_name, session_start etc are special functions that can only be called BEFORE information has been sent to the browser.