Error appearing on error log

Hello,

I have this error and would be very grateful for any assistance in fixing it please.

PHP Warning: session_start() [<a href='function.session-start'>function.session-start</a>]: Cannot send session cookie - headers already sent in /home/m24gems/public_html/system/library/session.php on line 11

I have attached my session.php file.

Could it be an extension causing it or is it a problem with my Opencart installation?

Thanks in advance

You can make a new subdirectory, /vqmod/xml/testsetaside/, slip the .xml files into that (EXCEPT the open_cart one, which is required for vqmod to work), and see whether extension(s) give(s) rise to the error. You can also look at both /vqmod/logs/ and /system/logs/ when this sort of thing happens, in order to try to pinpoint it.

Ok I will try that, thank you for your assistance.