Problems with custom fields and CSV document

I'm using HikaShop Essential and trying to add custom fields. I've got the fields and the csv set up accordingly (I hope), however I keep getting the following error...

1 products found : 0 new products imported, 1 invalid product code, 0 already existing products

I'm uploading the csv file I'm testing with and am totally prepared to feel stupid

Thanks.

Hi,

You need to have at least a product_code or a product_name field so that the product can be identified (maybe you want the "variant" column to be product_code ?). Also, the stock_number column should be called product_quantity, comments should be product_description, and price should be price_value.

Worked perfectly, thanks