I know this message, I have gotten this before. I was not able to open up my project at all. However, I was not that far into my project when I started having that problem. So, I made copies of the project as I worked - pretty much every time I did an edit sequence, I made a copy. This was NOT the optimal way to work, however, I was able to open a prior saved copy and work from there. I had to delete the project I was working on, as it was not possible to do anything with it. I hope you found a better way/or resolution to this. Were you able to re-open, recover???
Zoe. . .yes, thanks. I tried making a copy. . .still nothing. I've opened up projects that have nothing to do with this and have even started new ones. . .No rendering. . .weird. It was working fine two days ago. . .