[Error] 
Undefined constant "Bitrix\Main\Diag\ASSERT_QUIET_EVAL" (0)
/var/www/vhosts/vitart-stom.ru/httpdocs/bitrix/modules/main/lib/diag/exceptionhandler.php:244
#0: Bitrix\Main\Application->initializeExceptionHandler
	/var/www/vhosts/vitart-stom.ru/httpdocs/bitrix/modules/main/lib/application.php:105
#1: Bitrix\Main\Application->initializeBasicKernel
	/var/www/vhosts/vitart-stom.ru/httpdocs/bitrix/modules/main/start.php:1
#2: require_once(string)
	/var/www/vhosts/vitart-stom.ru/httpdocs/bitrix/modules/main/include.php:10
#3: require_once(string)
	/var/www/vhosts/vitart-stom.ru/httpdocs/bitrix/modules/main/include/prolog_before.php:14
#4: require_once(string)
	/var/www/vhosts/vitart-stom.ru/httpdocs/bitrix/modules/main/include/prolog.php:10
#5: require_once(string)
	/var/www/vhosts/vitart-stom.ru/httpdocs/bitrix/header.php:1
#6: require(string)
	/var/www/vhosts/vitart-stom.ru/httpdocs/about/index.php:4