[RuntimeException] 
Could not start session because headers have already been sent. "/var/www/yamed/data/www/yamed.ru/campaign/immunity/inc/section_head_scripts.inc":1. (0)
/var/www/yamed/data/www/yamed.ru/bitrix/modules/main/lib/session/session.php:117
#0: Bitrix\Main\Session\Session->start()
	/var/www/yamed/data/www/yamed.ru/bitrix/modules/main/lib/session/kernelsessionproxy.php:42
#1: Bitrix\Main\Session\KernelSessionProxy->start()
	/var/www/yamed/data/www/yamed.ru/bitrix/modules/main/include.php:180
#2: require_once(string)
	/var/www/yamed/data/www/yamed.ru/bitrix/modules/main/include/prolog_before.php:14
#3: require(string)
	/var/www/yamed/data/www/yamed.ru/campaign/immunity/inc/menu.php:12
#4: include(string)
	/var/www/yamed/data/www/yamed.ru/campaign/immunity/inc/section_header.inc:145
#5: include(string)
	/var/www/yamed/data/www/yamed.ru/campaign/immunity/index.php:254