Bitrix: CIBlockXMLFile class is not executed in the "Custom PHP script" section, what's wrong?

Question

PHP

It is necessary to perform (for example) creation of class $obXMLFile = new CIBlockXMLFile;
The system returns an error: "An error occurred while executing the script."
The end goal (for now) is to delete the result of the previous boot.
$obXMLFile = new CIBlockXMLFile;
$obXMLFile->DropTemporaryTables();
What am I doing wrong?

Answer 1

the ultimate goal is to upload an XML file with the structure of the nomenclature / groups, lying on the server / hosting.
(the XML structure is identical to the one that arrives from 1s during direct exchange) took
as an example

Answer 2

Add first\Bitrix\Main\Loader::includeModule('iblock');