I'm completely new in this world, so I hope you can help me out

I'd like to achieve this: Fill in the missing details through the ICECat database.
Maybe I'm thinking to simple here .. I've got a CSV file and created a template based on the available fields.
The fields I've got so far:
product_id, ean (sku), qty, date, price, tax, category, name, short_description, description
I skip the fields Product_id, date, price, tax and short_description in the field mapper and created a template based on this files.
Everything works ok if I fill in all of the data myself. But I thought that, when I leave i.e. the Description empty, it would fill itself through the ICECat database, or am I wrong? What happens then, is that I get an error what says: Language is missing.

Solving this would bring me to a higher level

Thank you very much for thinking with me
