Incomplete loading error

A song I’ve been working on for months suddenly will not load. Everything has been running perfectly until a few days ago. All of my other songs load as normal but this one just shows a message that says, “Incomplete Loading” and then “Load Error”. All of the audio files are there in the Audio Pool but the song doesn’t show up and there are no tracks showing, just vertical lines in the left column where the individual track icons should be. Any ideas? This is on Cubase VST 32 5.0. Thanks