# Failed to start the session because headers have already been sent by **URL:** \ **Category:** Product Support\ **Created:** [September 27, 2016, 8:36pm UTC](https://forum.mautic.org/t/failed-to-start-the-session-because-headers-have-already-been-sent-by/5484 "2016-09-27T20:36:08Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![herek](https://avatars.discourse-cdn.com/v4/letter/h/c6cbf5/32.png) [@herek](https://forum.mautic.org/u/herek)\ **Post date:** [September 27, 2016, 8:36pm UTC](https://forum.mautic.org/t/failed-to-start-the-session-because-headers-have-already-been-sent-by/5484/1 "2016-09-27T20:36:08Z")
I am facing a problem and I believe it’s with Vtiger integration. I have tested before and it was working perfectly , but today, with a new campaing (with a new custom field ) I am getting erros: This is that I can see at cron httpdocs/emm/app/console mautic:campaigns:trigger Triggering scheduled events 43 total events(s) to be processed in batches of 100 0/43 [\>---------------------------] 0% [RuntimeException] Failed to start the session because headers have already been sent by “/var/www/vhosts/doctorscopic.com/httpdocs/emm/app/bundles/EmailBundle/Model/EmailModel.php” at line 1164. mautic:campaigns:trigger [-i|–campaign-id [CAMPAIGN-ID]] [-l|–batch-limit [BATCH-LIMIT]] [-m|–max-events [MAX-EVENTS]] [-f|–force] [-h|–help] [-q|–quiet] [-v|vv|vvv|–verbose] [-V|–version] [-n|–no-interaction] [-s|–shell] [-e|–env ENV] Does anybody have an idea how to solve it? Is it related to Vtiger integration? Thank you ---
**Author:** ![herek](https://avatars.discourse-cdn.com/v4/letter/h/c6cbf5/32.png) [@herek](https://forum.mautic.org/u/herek)\ **Post date:** [September 27, 2016, 8:36pm UTC](https://forum.mautic.org/t/failed-to-start-the-session-because-headers-have-already-been-sent-by/5484/2 "2016-09-27T20:36:08Z")
I am facing a problem and I believe it’s with Vtiger integration. I have tested before and it was working perfectly , but today, with a new campaing (with a new custom field ) I am getting erros: This is that I can see at cron httpdocs/emm/app/console mautic:campaigns:trigger Triggering scheduled events 43 total events(s) to be processed in batches of 100 0/43 [\>---------------------------] 0% [RuntimeException] Failed to start the session because headers have already been sent by “/var/www/vhosts/doctorscopic.com/httpdocs/emm/app/bundles/EmailBundle/Model/EmailModel.php” at line 1164. mautic:campaigns:trigger [-i|–campaign-id [CAMPAIGN-ID]] [–scheduled-only] [–negative-only] [-l|–batch-limit [BATCH-LIMIT]] [-m|–max-events [MAX-EVENTS]] [-f|–force] [-h|–help] [-q|–quiet] [-v|vv|vvv|–verbose] [-V|–version] [–ansi] [–no-ansi] [-n|–no-interaction] [-s|–shell] [–process-isolation] [-e|–env ENV] [–no-debug] [–] Does anybody have an idea how to solve it? Is it related to Vtiger integration? Thank you