Score Not Opening

So I'd finished working on a project for a while, and I went to save it. It was my first save, so I named it and everything and pressed save(with the intention of saving to the cloud). For whatever reason, afterwards musescore didnt close, so I clicked the x to close it, but it wouldn't close, so I left clicked and closed it using the taskbar. Now, opening the file it says "Your score cannot be opened. This score is invalid". I tried looking for a backup of it, but no backup was saved of it. I dont know what to do at all.