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[RuntimeException] 
Could not start session because headers have already been sent. "/home/b/balashgt/centreal.ru/public_html/site_dm/ajax/review.php":5. (0)
/home/b/balashgt/centreal.ru/public_html/bitrix/modules/main/lib/session/session.php:124
#0: Bitrix\Main\Session\Session->start()
	/home/b/balashgt/centreal.ru/public_html/bitrix/modules/main/lib/session/kernelsessionproxy.php:52
#1: Bitrix\Main\Session\KernelSessionProxy->start()
	/home/b/balashgt/centreal.ru/public_html/bitrix/modules/main/include.php:299
#2: require_once(string)
	/home/b/balashgt/centreal.ru/public_html/bitrix/modules/main/include/prolog_before.php:14
#3: require_once(string)
	/home/b/balashgt/centreal.ru/public_html/bitrix/modules/main/include/prolog.php:10
#4: require_once(string)
	/home/b/balashgt/centreal.ru/public_html/bitrix/header.php:1
#5: require(string)
	/home/b/balashgt/centreal.ru/public_html/site_dm/ajax/review.php:12