this errors occurs if there is any output to the page, before the session_start() or header function is used.
See the following page for details:
from the text of the error:
output started at /home/alamatic/Q7FT7IOY/htdocs/CMS/Connections/localhost.php:12
look at line 11 and 12 of the Connections/localhost.php file for a blank line or space after the ?> tag