Warning audio data files missing

Hello,

I have a problem when i launch an Audacity project. I worked A LOT of hours on this project, i didn’t move any folders (like the data folder) or files and i get an error message indicating that audacity can’t file hundreds of audio files in the data folder. The data folder exists, there is a lot of files in it already. I don’t understand why suddenly Audacity can’t find the files.

the data folder of the project is on the same level of the project file.

Do you have any idea on how i can recover the files or the tracks lost ? I’m very frustrated and i’m scared by opening any new or old projects on my PC right now :-/

I’m using Audacity 2.3.2

Thank you.