Can't remove old products from cart

[Annakay]

Please help!
I have a problem. I recently upgraded a shop from osCommerce to oscMax and transferred all the data from the old shop, including the customers saved shopping carts. But now when a customer has a product in his cart that no longer exists in the shop, he can't remove it.
I tried to add a "Clear cart" button that calls the function
function remove_all() {
$this->reset();
}
in includes/classes/shopping_cart.php but it doesn't seem to do the trick either. Customers are still complaining since they can't check out with items in their cart that has insufficient stock.

Any ideas? (I hope you can understand my english )

[ALElder]

You need to clear all the sessions

That should fix this problem

Adam

[Annakay]

You need to clear all the sessions

That should fix this problem

Adam

Seriously? Because the sessions table were empty when I opened the new shop. But I will give it a try and let you know what happens.