Cannot Export or Save As Project

Hi, I’ve been working with Audacity to edit podcasts for several years now, and just upgraded to 3.0.2. While working on the most recent one, I finished the edit, and tried to export. When the progress bar was a third of the way through, the export failed with the error message, “Audacity failed to read a file on drive F:.” When I tried to save the project as a different file name, I got this error message:
My questions are:

  1. What’s gone wrong?
  2. Is this recoverable or am I utterly screwed?

The project file opens and plays back in Audacity without issue, as far as I can tell without sitting through all 62 minutes of it.

Try saving to your “Documents” folder. Does that work?