Aero project suddenly fails to open

Hi,

All of a sudden my aero file can't be opened anymore, and I get the message in the screenshot attached.

What can I do to recover the file, knowing that I didn't move the file (it's on the cloud) nor changed anything between the moment where the file was correctly opening and the moment where it stopped?

Thanks for helping out, I just lost a week's worth of work and am pretty upset. I could re create the file but if it is to get the same issue again I'd rather not trust Aero anymore.