[RuntimeException] 
Could not start session because headers have already been sent. "C:\OpenServer\OSold\domains\nashdetsky.ru\bitrix\managed_cache\MYSQL\b_option\2e\2e253c685b7c7d024ea4df067c3f9d7a.php":1. (0)
C:\OpenServer\OSold\domains\nashdetsky.ru\bitrix\modules\main\lib\session\session.php:133
#0: Bitrix\Main\Session\Session->start
	C:\OpenServer\OSold\domains\nashdetsky.ru\bitrix\modules\main\lib\session\kernelsessionproxy.php:42
#1: Bitrix\Main\Session\KernelSessionProxy->start
	C:\OpenServer\OSold\domains\nashdetsky.ru\bitrix\modules\main\include.php:166
#2: require_once(string)
	C:\OpenServer\OSold\domains\nashdetsky.ru\bitrix\modules\main\include\prolog_before.php:14
#3: require_once(string)
	C:\OpenServer\OSold\domains\nashdetsky.ru\bitrix\modules\main\include\prolog.php:10
#4: require_once(string)
	C:\OpenServer\OSold\domains\nashdetsky.ru\bitrix\header.php:1
#5: require(string)
	C:\OpenServer\OSold\domains\nashdetsky.ru\catalog\index.php:2
#6: include_once(string)
	C:\OpenServer\OSold\domains\nashdetsky.ru\bitrix\modules\main\include\urlrewrite.php:160
#7: include_once(string)
	C:\OpenServer\OSold\domains\nashdetsky.ru\bitrix\urlrewrite.php:2