Demo version of TBM - excel file importation


I've downloaded the demo version of Trados Business Manager, and I wanted to try to import my Excel invoicing file into it. But when I tried to import it, I got the following error message "Vous essayez d'importer un fichier qui ne contient pas de données pour la vue de liste actuellement ouverte." What does this error mean? I thought that this might be due to the names of the columns that were different between TBM and my Excel file, but then, when I wanted to edit the columns names in TBM, I saw that the edit button was disabled. 

How to proceed in this case? Is it possible to import an invoicing excel file to TBM?

thank you very much for your help.

Kind regards,

Cécile Spinelle

Freelance translator