You export your products and you get an error message like this one:
Incohérence pour le produit XXX-YYY(1/2) - "Description" manquant pour le produit
The description field is a mandatory field to export products to the marketplace. Therefore, products cannot be exported without description.
Please go to one of your products, and look what field you are used to fill in, Description or Summary:
Then please go to the module configuration, Settings tab and set the Description field accordingly;