Fatal error: Uncaught Error: Call to undefined function Bitrix\Main\Composite\mb_strlen() in /home/sm/public_html/bitrix/modules/main/lib/composite/helper.php:178 Stack trace: #0 /home/sm/public_html/bitrix/modules/main/lib/composite/responder.php(61): Bitrix\Main\Composite\Helper::isBitrixFolder() #1 /home/sm/public_html/bitrix/modules/main/lib/composite/responder.php(29): Bitrix\Main\Composite\Responder::isValidRequest() #2 /home/sm/public_html/bitrix/modules/main/include/prolog.php(7): Bitrix\Main\Composite\Responder::respond() #3 /home/sm/public_html/bitrix/header.php(1): require_once('/home/sm/public...') #4 /home/sm/public_html/stores/index.php(1): require('/home/sm/public...') #5 {main} thrown in /home/sm/public_html/bitrix/modules/main/lib/composite/helper.php on line 178