Whenever an item is left in an order and then you try to use the app when that item is not currently available, the app just doesn't work. You can't delete the order, you can't add items to the order, you can't access the cart to delete the items, the all is just left entirely unfunctional. After force stopping did nothing, I deleted and reinstalled and it worked, but then I had to deal with the log in screen which is much more difficult to use than that of other apps