Error when trying to generate new invoice pdf

[cyril_nel]

Hello,

i created a new class called OrderInvoiceCustom but when i try to generate the new pdf i get this error :

Catchable fatal error: Argument 1 passed to HTMLTemplateInvoiceCore::__construct() must be an instance of OrderInvoice, instance of OrderInvoiceCustom given, called in /newpresta/classes/pdf/PDF.php on line 127 and defined in /newpresta/classes/pdf/HTMLTemplateInvoice.php on line 41

The code is :

$oic->id_supplier = $id_supplier;
$order_invoice_list = $oic->getInvoicesCollectionBySupplier($id_order,$id_supplier);
$order_invoice_list2 = $order->getInvoicesCollection();
Hook::exec('actionPDFInvoiceRender', array('order_invoice_list' => $order_invoice_list));

$pdf = new PDF($order_invoice_list, 'InvoiceCustom', $context->smarty);
$pdf->render();

If you get any ideas i'm really interesting.