RuntimeException: Failed to start the session because headers have already been sent.

[lukeman83]

Hi, I integrated FOSUserBundle, FOSFacebookBundle, FOSRestFulBundle and others Bundles ant that's all right! Now I'm trying to integrate NelmioApiDocBundle but there is a problem in the FOSFacebookBundle. The error is:

RuntimeException: Failed to start the session because headers have already been sent.

at Session->start() in /home/project/domains/project.com/public_html/project_dev/vendor/friendsofsymfony/facebook-bundle/FOS/FacebookBundle/Facebook/FacebookSessionPersistence.php line 28

[Baachi]

Can you post the stacktrace?

[lukeman83]

Whoops, looks like something went wrong.

1/1RuntimeException: Failed to start the session because headers have already been sent. in /home/project/domains/project.com/public_html/project/app/cache/dev/classes.php line 180 at NativeSessionStorage->start() in /home/project/domains/project.com/public_html/project/app/cache/dev/classes.php line 786 at Session->start() in /home/project/domains/project.com/public_html/project/vendor/friendsofsymfony/facebook-bundle/FOS/FacebookBundle/Facebook/FacebookSessionPersistence.php line 28 at FacebookSessionPersistence->__construct(array('appId' => '519235104772246', 'secret' => 'be3a21787432ca512cae513cdc0c6b38', 'cookie' => true, 'domain' => null), object(Session)) in /home/project/domains/project.com/public_html/project/app/cache/dev/appDevDebugProjectContainer.php line 1043 at appDevDebugProjectContainer->getFosFacebook_ApiService() in /home/project/domains/project.com/public_html/project/app/bootstrap.php.cache line 211 at Container->get('fos_facebook.api') in /home/project/domains/project.com/public_html/project/app/cache/dev/appDevDebugProjectContainer.php line 5302 at appDevDebugProjectContainer->getSecurity_Authentication_ManagerService() in /home/project/domains/project.com/public_html/project/app/bootstrap.php.cache line 211 at Container->get('security.authentication.manager') in /home/project/domains/project.com/public_html/project/app/cache/dev/appDevDebugProjectContainer.php line 3229 at appDevDebugProjectContainer->getSecurity_ContextService() in /home/project/domains/project.com/public_html/project/app/bootstrap.php.cache line 211 at Container->get('security.context') in /home/project/domains/project.com/public_html/project/app/cache/dev/appDevDebugProjectContainer.php line 3051 at appDevDebugProjectContainer->getProfilerService() in /home/project/domains/project.com/public_html/project/app/bootstrap.php.cache line 211 at Container->get('profiler') in /home/project/domains/project.com/public_html/project/app/cache/dev/appDevDebugProjectContainer.php line 3069 at appDevDebugProjectContainer->getProfilerListenerService() in /home/project/domains/project.com/public_html/project/app/bootstrap.php.cache line 211 at Container->get('profiler_listener') in /home/project/domains/project.com/public_html/project/app/cache/dev/classes.php line 5047 at ContainerAwareEventDispatcher->lazyLoad('kernel.exception') in /home/project/domains/project.com/public_html/project/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Debug/ContainerAwareTraceableEventDispatcher.php line 174 at ContainerAwareTraceableEventDispatcher->lazyLoad('kernel.exception') in /home/project/domains/project.com/public_html/project/app/cache/dev/classes.php line 5031 at ContainerAwareEventDispatcher->dispatch('kernel.exception', object(GetResponseForExceptionEvent)) in /home/project/domains/project.com/public_html/project/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Debug/ContainerAwareTraceableEventDispatcher.php line 78 at ContainerAwareTraceableEventDispatcher->dispatch('kernel.exception', object(GetResponseForExceptionEvent)) in /home/project/domains/project.com/public_html/project/app/bootstrap.php.cache line 1463 at HttpKernel->handleException(object(RuntimeException), object(Request), '1') in /home/project/domains/project.com/public_html/project/app/bootstrap.php.cache line 1396 at HttpKernel->handle(object(Request), '1', true) in /home/project/domains/project.com/public_html/project/app/bootstrap.php.cache line 1566 at HttpKernel->handle(object(Request), '1', true) in /home/project/domains/project.com/public_html/project/app/bootstrap.php.cache line 617 at Kernel->handle(object(Request)) in /home/project/domains/project.com/public_html/project/web/app_dev.php line 30

[Baachi]

You have a site which prints anything before symfony is booted or the session is started. Check that each file starts with <?php.

[lukeman83]

Maybe NelmioApiDocBundle starts before all Bundles and FOSFacebookBundle try to reopen the same session?

[Baachi]

No, the NelmioApiDocBundle does not deal with the session component.

[lukeman83]

I have this problem only on the server-side. I don't have it i local-side.

[lukeman83]

Perfect!!! My AppKernel.php started with /<?php Many thanks!