ok, what have I done wrong? When I try to use Quick Updates, I get an error:

1054 Unknown column 'p.products_upc' in 'field list'
in:
[select p.products_id, p.products_type, p.products_image, p.products_model, pd.products_name, p.products_status, p.products_upc, p.products_isbn, p.products.epier, p.products_weight, p.products_quantity, p.manufacturers_id, p.products_price, p.products_tax_class_id, p.products_date_added, p.products_last_modified, p.products_date_available, p.products_quantity_order_min, p.products_quantity_order_units, p.products_priced_by_attribute, p.product_is_free, p.product_is_call, p.products_quantity_mixed, p.product_is_always_free_shipping, pd.products_description, p.products_quantity_order_max, p.products_sort_order, p.master_categories_id, m.manufacturers_name, p2c.categories_id from zen_products p LEFT JOIN zen_products_description pd ON (p.products_id = pd.products_id and pd.language_id = '1') LEFT JOIN zen_manufacturers m ON (p.manufacturers_id = m.manufacturers_id) LEFT JOIN zen_products_to_categories p2c ON (p.products_id = p2c.products_id) order by p.products_id DESC limit 0, 20]