How can I restore a project?

I have done a lot of writing in a project in the last few days and it has been all backed up. Today I was trying to back it up on my flash drive and for some reason or another, the current project was deleted. When I click to open Scrivener it says “Project cannot be found.” The only project I can open is an older version with none of my corkboard notes and all of the revisions and new work that I have committed to the project gone. How can I restore the newest version of my project? Have I lost all my recent work?