I got this problem. it has any spaces on prefix and suffix. It has been occurred sub domain on on-line, while start session. Don't block this as duplicate. If you want block this solve this before do that.still now no one else here to give ideas..
I have refer some bug issue solved in this.
i have refer this enter link description here
this is my code simple code.
<?php
ob_start();
session_start();
echo "hi uu";
?>
Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/content/93/11167393/html/safelearners/studiobadri/admin/index.php:1) in /home/content/93/11167393/html/safelearners/studiobadri/admin/index.php on line 2
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/content/93/11167393/html/safelearners/studiobadri/admin/index.php:1) in /home/content/93/11167393/html/safelearners/studiobadri/admin/index.php on line 2