Issue "1101: The specified product is not available for the country.;The specified product is not available for the country"

I have this code, When I try to generate DHL shipping label for Austria, in most cases it throws me this error, but sometimes it works fine.

Error: 1101: The specified product is not available for the country.;The specified product is not available for the country

Code:

$this->shipmentDetails = new ShipmentDetails($this->credentials->getEkp(10) . '5301');                  
$this->shipmentDetails->setProduct((string) ShipmentDetails::PRODUCT_TYPE_INTERNATIONAL_PACKAGE);