Twinfield gives error when I tried to create new invoice - php

Question

I want to create an invoice to third party invoice software i.e. twinfield from API. I give all the param according to its library and doc and call from API but it will give error.
{
"success": false,
"error": "Item code not found., The description of an item line cannot be adjusted." }
The API is php-twinfield.
The code is given below.
public function saveInvoice($values)
{
try
{
$user = $values['user'];
$password = $values['password'];
$organization = $values['organisation'];
$officecode = $values['officecode'];
$connection = new \PhpTwinfield\Secure\WebservicesAuthentication($user, $password, $organization);
$customerApiConnector = new \PhpTwinfield\ApiConnectors\CustomerApiConnector($connection);
$office = Office::fromCode($officecode);
$customer = $customerApiConnector->get('1008',$office);
$InvoiceApiConnector = new \PhpTwinfield\ApiConnectors\InvoiceApiConnector($connection);
//class invoiceline object
$line = new \PhpTwinfield\InvoiceLine();
$line
->setArticle(2)
->setQuantity(2)
->setValueExcl(100)
->setUnits(1)
->setVatCode('VH')
->setUnitsPriceExcl(100)
->setDim1(8020)
->setDescription("Testinvoice anand")
->setAllowDiscountOrPremium(false);
//class invoice object
$invoice = new \PhpTwinfield\Invoice();
$invoice
->setCustomer($customer)
->setBank('BNK')
->setDueDate(\Carbon\Carbon::now()->addMonth())
->setPeriod('2018/12')
->setCurrency('EUR')
->setStatus('concept')
->setInvoiceDate('20180606')
->addLine($line)
->setPaymentMethod('cash')
->setInvoiceType('FACTUUR');
$result = $InvoiceApiConnector->send($invoice);
print_r($result);
//$jsonResponse = JsonResponse::success($result);
}
catch (SoapFault $e)
{
$jsonResponse = empty($e->getMessage()) ? JsonResponse::error(class_basename($e)) : JsonResponse::error($e->getMessage());
}
//return $jsonResponse;
}
if change in this line $line->setArticle(0) the error is like that.
{
"success": false,
"error": "ResponseException" }