A problem caused the application to stop working correctly.

I'm working on a rather large project, and I had this notification pop up when I tried to reopen the project.

"A problem caused the application to stop working correctly."

After trying to find a solution, uninstalling and reinstalling the application several times, installing and trying to use previous versions of the application, and reupdating the application I finally gave up and started the project over. I had a good week's worth of work into it the first time, so I stayed up late restarting the project. All was going well. Decided to save it because things were starting to move slow. Closed the app so I could catch up on a few other things. When I try to open the new project, same error...

Now neither version of this project will open. I can't seem to find a way to convert what I have done to a different file format to keep working on it and at least salvage what I've done. I don't know what to do and am getting extremely frustrated.