WORLD_BUISINESS : Atleast one item data is required

[visualight]

I don't understand what's missing for an international delivery. The API returns: "Atleast one item data is required" and refuses to create the label.

Here's my code :

$delivery_costs = $transporter->delivery_costs;

                    switch ($carrierData['weight']) {
                        case 2000:
                            $delivery_price = 'cost_1';
                            break;
                        default:
                            $delivery_price = 'cost_2';
                            break;
                    }

                    if (is_numeric($delivery_costs[$carrierData['country']][$delivery_price])) {
                        $temp_price = (float)$delivery_costs[$carrierData['country']][$delivery_price];

                        if ($temp_price >= 0.00 && $temp_price <= 999.99) {
                            $formatted_price = number_format($temp_price, 2);
                        } else {
                            // La valeur est en dehors des limites autorisées
                            $formatted_price = "0.00";
                        }
                    } else {
                        // La valeur n'est pas numérique
                        $formatted_price = "0.00";
                    }

                    $customsInfo = new Box\CustomsInfo\CustomsInfo();
                    $customsInfo->setParcelValue($carrierData['total']); // INT
                    $customsInfo->setCurrency(Bpost\Order\Box\CustomsInfo\CustomsInfo::CUSTOM_INFO_CURRENCY_EUR);
                    $customsInfo->setAmtPostagePaidByAddresse($formatted_price); //FLOAT : String
                    $customsInfo->setContentDescription('FASHION');
                    $customsInfo->setShipmentType(Bpost\Order\Box\CustomsInfo\CustomsInfo::CUSTOM_INFO_SHIPMENT_TYPE_GOODS);
                    $customsInfo->setParcelReturnInstructions(Bpost\Order\Box\CustomsInfo\CustomsInfo::CUSTOM_INFO_PARCEL_RETURN_INSTRUCTION_RTS);
                    $customsInfo->setPrivateAddress(true);

                    $international = new Box\International();
                    $international->setProduct(Bpost\ProductConfiguration\Product::PRODUCT_NAME_BPACK_WORLD_BUSINESS);
                    $international->setReceiver($receiver);
                    $international->setParcelWeight($carrierData['weight']);
                    $international->setCustomsInfo($customsInfo);

                    $box->setInternationalBox($international);