Hi,
Add the code:
$category = hikashop_get('type.categorysub');
$category->type = 'status';
$category->load(true);
$this->assignRef('order_statuses',$category);
$cart = hikashop_get('helper.cart');
$this->assignRef('cart',$cart);
$currencyClass = hikashop_get('class.currency');
$this->assignRef('currencyHelper',$currencyClass);
after the line:
public function listing() {
in the file components/com_hikashop/views/order/view.html.php
That's because you have a view override of the orders listing view file from an old version of HikaShop and we've completely rewritten it for HikaShop 3.0.0. This code change I'm proposing will add the backward compatibility so that you should be able to keep your view override.