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. Products can not be exported without description.
However, it is also a module adjustment, make sure the module is configured to export the right description field, since in Prestashop, there are two; Description and Summary. It may be that only one of the two is filled on your store.
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;