[RuntimeException] Could not start session because headers have already been sent. "/home/bitrix/ext_www/slavia.by/promo/verum/index.php":169. (0) /home/bitrix/ext_www/slavia.by/bitrix/modules/main/lib/session/session.php:133 #0: Bitrix\Main\Session\Session->start() /home/bitrix/ext_www/slavia.by/bitrix/modules/main/lib/session/kernelsessionproxy.php:42 #1: Bitrix\Main\Session\KernelSessionProxy->start() /home/bitrix/ext_www/slavia.by/bitrix/modules/main/include.php:166 #2: require_once(string) /home/bitrix/ext_www/slavia.by/bitrix/modules/main/include/prolog_before.php:14 #3: require_once(string) /home/bitrix/ext_www/slavia.by/local/include/ajax_shops.php:12 #4: require(string) /home/bitrix/ext_www/slavia.by/promo/verum/index.php:171