dev<pre>[RuntimeException] 
Could not start session because headers have already been sent. &quot;/home/a/avkorodb/new.fenix-siz.ru/public_html/local/php_interface/s2/init.php&quot;:262. (0)
/home/a/avkorodb/new.fenix-siz.ru/public_html/bitrix/modules/main/lib/session/session.php:143
#0: Bitrix\Main\Session\Session-&gt;start()
	/home/a/avkorodb/new.fenix-siz.ru/public_html/bitrix/modules/main/lib/session/kernelsessionproxy.php:47
#1: Bitrix\Main\Session\KernelSessionProxy-&gt;start()
	/home/a/avkorodb/new.fenix-siz.ru/public_html/bitrix/modules/main/include.php:182
#2: require_once(string)
	/home/a/avkorodb/new.fenix-siz.ru/public_html/bitrix/modules/main/include/prolog_before.php:19
#3: require_once(string)
	/home/a/avkorodb/new.fenix-siz.ru/public_html/local/api/courses/v1/plan.php:3
----------
</pre>