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Module creation and Object DOMDocument should be created error

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Module creation and Object DOMDocument should be created error

Hello to all!
I've created a Magento2 module that shows a page in the admin panel (under a specific menu item in content section).

when I enter echo "hello world"; in the file app/code/Myname/Mymodule/Block/Landingpage.php
I see the page correctly,
but when I call up a namespace like this:

<?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL | E_STRICT);

require '../../PHP_SDK/ebay-sdk-php-autoloader.php';
$config = require '../../configuration.php';

use \DTS\eBaySDK\Constants;
use \DTS\eBaySDK\Trading\Services;
use \DTS\eBaySDK\Trading\Types;
use \DTS\eBaySDK\Trading\Enums;

$service = new Services\TradingService([
...
]);
?>

I get this error message:
<<
There has been an error processing your request

Object DOMDocument should be created.
>>

You know why? Can you help me?
Many thanks!!!