Files are disappeared

I saved a copy of the project. Then I opened the first one and it was empty. I opened the second one, it was also empty. After restarting Nomad, all projects disappeared. All projects are lost and I don’t know what to do

With the information you provide the only thing I can tell you is, do you have backup copies?

What’s inside the Nomad folder?

There is no current project, previous files are ok