Каталог мебели

[Error] 
Class 'CIBlockSection' not found (0)
/home/bitrix/www/catalog/reg_section.php:83
#0: include
	/home/bitrix/www/catalog/section.php:110
#1: include_once(string)
	/home/bitrix/www/bitrix/modules/main/include/urlrewrite.php:159
#2: include_once(string)
	/home/bitrix/www/404.php:3