Error when uploading a product to a market place

Some products do not upload to eBay MarketPlace because it says there is a system error. Does anyone know what it could be?

Hello this has also happened to my store also a few months back and with the help of my digital marketer, I was able to upload many products again and if you don’t mind I can also refer him to you so that you can have a chat with him and he will get it done for you.

Here is my Gmail

ecaterinaelizabeta@gmail.com

contact me now if you would like her to get in touch with her so that she can help you get this done.

Thank you