ErrorException:
Warning: ini_set(): Session ini settings cannot be changed after headers have already been sent

  at /Users/michalszoltysek/Projects/workspace/ibexa_website/vendor/symfony/http-foundation/Session/Storage/Handler/NativeFileSessionHandler.php:53
  at Symfony\Component\HttpFoundation\Session\Storage\Handler\NativeFileSessionHandler->__construct('/Users/michalszoltysek/Projects/workspace/ibexa_website/var/sessions/dev')
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/var/cache/dev/Container57cMeM9/getSession_Storage_Factory_NativeService.php:28)
  at Container57cMeM9\getSession_Storage_Factory_NativeService::do(object(App_KernelDevDebugContainer), true)
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/var/cache/dev/Container57cMeM9/App_KernelDevDebugContainer.php:1405)
  at Container57cMeM9\App_KernelDevDebugContainer->load('getSession_Storage_Factory_NativeService')
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/var/cache/dev/Container57cMeM9/getSession_FactoryService.php:29)
  at Container57cMeM9\getSession_FactoryService::do(object(App_KernelDevDebugContainer), true)
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/var/cache/dev/Container57cMeM9/App_KernelDevDebugContainer.php:1405)
  at Container57cMeM9\App_KernelDevDebugContainer->load('getSession_FactoryService')
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/var/cache/dev/Container57cMeM9/get_Container_Private_SessionService.php:23)
  at Container57cMeM9\get_Container_Private_SessionService::do(object(App_KernelDevDebugContainer), true)
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/var/cache/dev/Container57cMeM9/App_KernelDevDebugContainer.php:1405)
  at Container57cMeM9\App_KernelDevDebugContainer->load('get_Container_Private_SessionService')
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/var/cache/dev/Container57cMeM9/getFlashBagNotificationHandlerService.php:23)
  at Container57cMeM9\getFlashBagNotificationHandlerService::do(object(App_KernelDevDebugContainer), true)
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/var/cache/dev/Container57cMeM9/App_KernelDevDebugContainer.php:1405)
  at Container57cMeM9\App_KernelDevDebugContainer->load('getFlashBagNotificationHandlerService')
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/var/cache/dev/Container57cMeM9/getAdminExceptionListenerService.php:33)
  at Container57cMeM9\getAdminExceptionListenerService::do(object(App_KernelDevDebugContainer), true)
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/var/cache/dev/Container57cMeM9/App_KernelDevDebugContainer.php:1405)
  at Container57cMeM9\App_KernelDevDebugContainer->load('getAdminExceptionListenerService')
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/var/cache/dev/Container57cMeM9/App_KernelDevDebugContainer.php:1867)
  at Container57cMeM9\App_KernelDevDebugContainer->Container57cMeM9\{closure}()
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/vendor/symfony/event-dispatcher/EventDispatcher.php:164)
  at Symfony\Component\EventDispatcher\EventDispatcher->removeListener('kernel.exception', array(object(ConvertNotValidMaxPerPageToNotFoundListener), 'onKernelException'))
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcher.php:297)
  at Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher->preProcess('kernel.exception')
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcher.php:148)
  at Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher->dispatch(object(ExceptionEvent), 'kernel.exception')
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/vendor/symfony/http-kernel/HttpKernel.php:223)
  at Symfony\Component\HttpKernel\HttpKernel->handleThrowable(object(ErrorException), object(Request), 1)
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/vendor/symfony/http-kernel/HttpKernel.php:114)
  at Symfony\Component\HttpKernel\HttpKernel->terminateWithException(object(ErrorException), object(Request))
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/vendor/symfony/http-kernel/EventListener/DebugHandlersListener.php:131)
  at Symfony\Component\HttpKernel\EventListener\DebugHandlersListener::Symfony\Component\HttpKernel\EventListener\{closure}(object(ErrorException))
     (/Users/michalszoltysek/Projects/workspace/ibexa_website/vendor/symfony/error-handler/ErrorHandler.php:607)
  at Symfony\Component\ErrorHandler\ErrorHandler->handleException(object(ErrorException))