Error Importing?

I’m having trouble opening a specific project file; when I try to open it (whether from my project folder or in the program itself), this message shows up:

“Error Importing - C:\users.… is an Audacity Project File. Use the ‘File > Open’ command to open Audacity projects.”

This is exactly what I am doing (as well as opening it straight from the folder), and every other project file I have will open and play just fine, no matter which method I use to open the file. Nothing was moved; nothing was changed. The AUP file and its folder still exist in the same exact location, but I cannot open the project.

Help?

Try opening the AUP file in a text editor. Is it empty?

Koz