Календарь событий

[Error] 
Call to undefined function cal_days_in_month() (0)
/home/h010448447/bullafond.ru/docs/bitrix/templates/.default/components/bitrix/news.calendar/ee_bullafond/result_modifier.php:12
#0: include
	/home/h010448447/bullafond.ru/docs/bitrix/modules/main/classes/general/component_template.php:868
#1: CBitrixComponentTemplate->__IncludeMutatorFile(array, array)
	/home/h010448447/bullafond.ru/docs/bitrix/modules/main/classes/general/component_template.php:775
#2: CBitrixComponentTemplate->IncludeTemplate(array)
	/home/h010448447/bullafond.ru/docs/bitrix/modules/main/classes/general/component.php:681
#3: CBitrixComponent->showComponentTemplate()
	/home/h010448447/bullafond.ru/docs/bitrix/modules/main/classes/general/component.php:629
#4: CBitrixComponent->includeComponentTemplate()
	/home/h010448447/bullafond.ru/docs/bitrix/components/bitrix/news.calendar/component.php:385
#5: include(string)
	/home/h010448447/bullafond.ru/docs/bitrix/modules/main/classes/general/component.php:548
#6: CBitrixComponent->__includeComponent()
	/home/h010448447/bullafond.ru/docs/bitrix/modules/main/classes/general/component.php:600
#7: CBitrixComponent->includeComponent(string, array, boolean)
	/home/h010448447/bullafond.ru/docs/bitrix/modules/main/classes/general/main.php:1035
#8: CAllMain->IncludeComponent(string, string, array, boolean)
	/home/h010448447/bullafond.ru/docs/bitrix/templates/.default/components/bitrix/news/calendar/news.php:67
#9: include(string)
	/home/h010448447/bullafond.ru/docs/bitrix/modules/main/classes/general/component_template.php:714
#10: CBitrixComponentTemplate->__IncludePHPTemplate(array, array, string)
	/home/h010448447/bullafond.ru/docs/bitrix/modules/main/classes/general/component_template.php:806
#11: CBitrixComponentTemplate->IncludeTemplate(array)
	/home/h010448447/bullafond.ru/docs/bitrix/modules/main/classes/general/component.php:681
#12: CBitrixComponent->showComponentTemplate()
	/home/h010448447/bullafond.ru/docs/bitrix/modules/main/classes/general/component.php:629
#13: CBitrixComponent->includeComponentTemplate(string)
	/home/h010448447/bullafond.ru/docs/bitrix/components/bitrix/news/component.php:216
#14: include(string)
	/home/h010448447/bullafond.ru/docs/bitrix/modules/main/classes/general/component.php:548
#15: CBitrixComponent->__includeComponent()
	/home/h010448447/bullafond.ru/docs/bitrix/modules/main/classes/general/component.php:600
#16: CBitrixComponent->includeComponent(string, array, boolean)
	/home/h010448447/bullafond.ru/docs/bitrix/modules/main/classes/general/main.php:1035
#17: CAllMain->IncludeComponent(string, string, array, boolean)
	/home/h010448447/bullafond.ru/docs/calendar/index.php:106