Trouble opening the project

I beg you to help me when I neared the end of my project, I closed it yesterday, and I try to give it today to complete it. This message appears … How can I solve it?

my version is

Check the finder. Is the file actually there?

Yes, it does

Have you tried opening it again from the File menu?

If that does not work, the project may be corrupt. Do you have a backup?