I am having the exact same issue although I'm having it on multiple projects. There really is no sense to it. I've created new projects and imported the projects, which works... but then when PPro crashes for other reasons and I attempt to open that "new and fixed" project I get the same problem...
I have trashed preferences, created new projects, turned off Mercury Transmit, resisted throwing my computer across the room and really questioned why I am still using PPro instead of Resolve.
For the amount we pay, this is not accepatable.
For my setup and this instance: I am working in a Production