< ?php $arUrlRewrite=array ( array ( 'CONDITION' => '#^/([a-zA-Z0-9_-]*)/([a-zA-Z0-9_-]*)/#', 'RULE' => "tw=n&folder=$1ยง=$2&$3", 'SORT' => 100, 'ID' => '', 'PATH' => '/$1/index.php', ), );
[RuntimeException] 
Could not start session because headers have already been sent. "/home/s/siteform/siteform.ru/public_html/urlrewrite.php":1. (0)
/home/s/siteform/siteform.ru/public_html/bitrix/modules/main/lib/session/session.php:141
#0: Bitrix\Main\Session\Session->start()
	/home/s/siteform/siteform.ru/public_html/bitrix/modules/main/lib/session/kernelsessionproxy.php:42
#1: Bitrix\Main\Session\KernelSessionProxy->start()
	/home/s/siteform/siteform.ru/public_html/bitrix/modules/main/include.php:169
#2: require_once(string)
	/home/s/siteform/siteform.ru/public_html/bitrix/modules/main/include/prolog_before.php:14
#3: require_once(string)
	/home/s/siteform/siteform.ru/public_html/bitrix/modules/main/include/prolog.php:10
#4: require_once(string)
	/home/s/siteform/siteform.ru/public_html/bitrix/header.php:1
#5: require(string)
	/home/s/siteform/siteform.ru/public_html/404.php:8
#6: include_once(string)
	/home/s/siteform/siteform.ru/public_html/bitrix/urlrewrite.php:4
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