Fatal error: Uncaught ValueError: DOMDocument::loadXML(): Argument #1 ($source) must not be empty in C:\xampp\@payment.diginet.com\nlb\src\Xml\Parser.php:113 Stack trace: #0 C:\xampp\@payment.diginet.com\nlb\src\Xml\Parser.php(113): DOMDocument->loadXML('') #1 C:\xampp\@payment.diginet.com\nlb\src\Client.php(692): PaymentGateway\Client\Xml\Parser->parseCallback('') #2 C:\xampp\@payment.diginet.com\nlb\callback.php(14): PaymentGateway\Client\Client->readCallback('') #3 {main} thrown in C:\xampp\@payment.diginet.com\nlb\src\Xml\Parser.php on line 113