I'm testing to add custom pages to osTicket 1.9.8.1.In our PHP pages, we need to retrieve the staff ID for access right checking. So we have the below 2 lines in the caller PHP page (1st page).~~~~~~~require('staff.inc.php');$staff_id = $thisstaff->getId();.. then declare session variable to store this staff_id and pass to subsequent PHP pages.~~~~~~~In order for the subsequent PHP page (2nd page) to retrieve session variable, we have to do "require('staff.inc.php');" again at the top of the 2nd page.However, the follow warning always happen.=========== PHP Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/xxx/public_html/ct1/scp/ctouthtml.php) in /home/xxx/public_html/ct1/include/class.ostsession.php on line 86===========Any advice on how to avoid this warning and at the same time can pass on the session variables please?