1<pre>[RuntimeException] 
Could not start session because headers have already been sent. &quot;/var/www/u0222767/data/www/c-clinica.com/diagnostika/uzi-molochnykh-zhelez-v-astrakhani/index.php&quot;:1. (0)
/var/www/u0222767/data/www/c-clinica.com/bitrix/modules/main/lib/session/session.php:151
#0: Bitrix\Main\Session\Session-&gt;start()
	/var/www/u0222767/data/www/c-clinica.com/bitrix/modules/main/lib/session/kernelsessionproxy.php:47
#1: Bitrix\Main\Session\KernelSessionProxy-&gt;start()
	/var/www/u0222767/data/www/c-clinica.com/bitrix/modules/main/include.php:180
#2: require_once(string)
	/var/www/u0222767/data/www/c-clinica.com/bitrix/modules/main/include/prolog_before.php:19
#3: require_once(string)
	/var/www/u0222767/data/www/c-clinica.com/bitrix/modules/main/include/prolog.php:10
#4: require_once(string)
	/var/www/u0222767/data/www/c-clinica.com/bitrix/header.php:1
#5: require(string)
	/var/www/u0222767/data/www/c-clinica.com/diagnostika/uzi-molochnykh-zhelez-v-astrakhani/index.php:1
----------
</pre>