[Error] 
Undefined class constant 'BASE_TYPE_STRING' (0)
/var/www/ms_prod/data/www/httpdocs/bitrix/modules/calendar/lib/userfield/resourcebooking.php:34
#0: Bitrix\Calendar\UserField\ResourceBooking::getUserTypeDescription()
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/main/classes/general/module.php:490
#1: ExecuteModuleEventEx(array)
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/main/classes/general/usertype.php:927
#2: CAllUserTypeManager->GetUserType(string)
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/main/classes/general/usertype.php:1036
#3: CAllUserTypeManager->GetUserFields(string)
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/main/classes/general/usertype.php:2542
#4: CUserTypeSQL->SetEntity(string, string)
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/iblock/classes/mysql/iblocksection.php:17
#5: CIBlockSection::GetList(array, array, boolean, array)
	/var/www/ms_prod/data/www/httpdocs/bitrix/components/bitrix/menu.sections/component.php:46
#6: include(string)
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/main/classes/general/component.php:548
#7: CBitrixComponent->__includeComponent()
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/main/classes/general/component.php:600
#8: CBitrixComponent->includeComponent(string, array, boolean)
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/main/classes/general/main.php:1035
#9: CAllMain->IncludeComponent(string, string, array, boolean, array)
	/var/www/ms_prod/data/www/httpdocs/.left.menu_ext.php:33
#10: include(string)
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/main/classes/general/menu.php:115
#11: CMenu->Init(string, boolean, string)
	/var/www/ms_prod/data/www/httpdocs/bitrix/components/bitrix/menu/component.php:53
#12: include(string)
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/main/classes/general/component.php:548
#13: CBitrixComponent->__includeComponent()
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/main/classes/general/component.php:94
#14: CBitrixComponent->executeComponent()
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/main/classes/general/component.php:585
#15: CBitrixComponent->includeComponent(string, array, boolean)
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/main/classes/general/main.php:1035
#16: CAllMain->IncludeComponent(string, string, array, boolean)
	/var/www/ms_prod/data/www/httpdocs/bitrix/templates/eshop_bootstrap_v4/header.php:142
#17: include_once(string)
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/main/include/prolog_after.php:96
#18: require(string)
	/var/www/ms_prod/data/www/httpdocs/bitrix/modules/main/include/prolog.php:11
#19: require_once(string)
	/var/www/ms_prod/data/www/httpdocs/bitrix/header.php:1
#20: require(string)
	/var/www/ms_prod/data/www/httpdocs/index.php:2