I can't add an item to cart. It says "this product combination does not exist".

Make sure you have not deleted the product and are using the latest button code from Seller Admin for your product.

You might have pasted the Add to Cart button code before customizing the product's Item Number in your Seller Admin, so the original Item Number referenced in the button code we issued would no longer work after that number gets changed. To fix this, use the latest Add to Cart code we provide for the product, or edit your site's existing code to reference the new Item Number (the &i=XXXXXX component of your button URL).

Also, if you are using "Variants which affect price/weight/stock/SKU", that error can happen if you select a combination of options to Add to Cart when that particular combination is missing from your Variants configuration lines.

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