Error opening project (RestoreWorkspace)

A student reported to me that their project won't open. I have not been successful in opening it either or trying to repair the .Rproj file which seems to be the problem. They also reported that their file (quarto doc) disappeared, but the objects are still in the environment so I'm hoping the file is in the trash somewhere. This is the project: Posit Cloud.

Screenshot 2024-11-13 at 6.34.06 PM