Fatal error: Uncaught Error: Call to undefined function Bitrix\Main\IO\mb_substr() in D:\ktt\ttepla.com\public_html\bitrix\modules\main\lib\io\path.php:77
Stack trace:
#0 D:\ktt\ttepla.com\public_html\bitrix\modules\main\lib\localization\loc.php(70): Bitrix\Main\IO\Path::normalize()
#1 D:\ktt\ttepla.com\public_html\bitrix\modules\main\lib\orm\fields\validators\validator.php(15): Bitrix\Main\Localization\Loc::loadMessages()
#2 D:\ktt\ttepla.com\public_html\bitrix\modules\main\lib\loader.php(430): require_once('...')
#3 [internal function]: Bitrix\Main\Loader::autoLoad()
#4 D:\ktt\ttepla.com\public_html\bitrix\modules\main\include\compatibility.php(30): class_alias()
#5 D:\ktt\ttepla.com\public_html\bitrix\modules\main\include\autoload.php(183): require_once('...')
#6 D:\ktt\ttepla.com\public_html\bitrix\modules\main\start.php(13): require_once('...')
#7 D:\ktt\ttepla.com\public_html\bitrix\modules\main\include.php(14): require_once('...')
#8 D:\ktt\ttepla.com\public_html\bitrix\modules\main\include\prolog_before.php(19): require_once('...')
#9 D:\ktt\ttepla.com\public_html\init.php(7): require('...')
#10 D:\ktt\ttepla.com\public_html\post\tariff.php(2): require_once('...')
#11 {main}
thrown in D:\ktt\ttepla.com\public_html\bitrix\modules\main\lib\io\path.php on line 77