Complete error message: eBay The UPC/ISBN field is missing. Please add UPC to the listing and try again. ErrorCode: 21919301. The UPC field is missing. Please add UPC to the listing and try again. ErrorCode: 21919301 Need help. EAN has an invalid value of. Please try again. ErrorCode: 21919302. The EAN field is missing. Please add EAN to the listing and try again. ErrorCode: 21919301
Since ISBNs/UPCs are not mandatory on eBay (excluding certain product categories, such as books), error 21919301 is probably due to an incorrect category placement.
Make sure you have left the barcode field blank and retry.
Try editing the listing and publishing it by changing the category. You should change the category. To do it:
Open the Product Tab
Click on the product in error
Click on “Edit”
Choose a category similar to the one you were trying to list your product in, and type it in the category field.
Click on save.