Project not loaded, damaged or outdated elements!

[Plamena5C80]

I got a sudden message that I need to free more space on my pc, so I immediately saved my project and started backing up old folders to my hard drive. (I didn't touch any of the folders containing the media I'm using for the project in question).
As I was copying lots of GB on my hard drive I decided to close Premiere Pro (2020), when I hit the close button it asked me if I want to save my project again, so I did it one more time and closed the program.
When later I tried to open my project I got this message: "The project could not be loaded, it may be damaged or contain outdated elements."
I immediately tried to open the last auto-saved projects but they didn't open eighter and I got the SAME message! I managed to open a saved project from a day earlier, but this means TONS of work LOST !
Can anyone help me fix that??? I'm on a terrible deadline and Adobe Premiere Pro have just sent me back to the Dark Ages....
I have already tried all this with no result: 
- Importing the project into a new one
- Logged out from cloud, restart pc and logg in again
- I've copied the project and tried to open it on another pc
 - I've opened adobe offline
- I tried opening the project in after effects
... NOTHING works

[Carlos Ziade]

if your project is located on an external drive, try to move it to a local one

with all assets used.. if you can find the preview video files associated 

with it (render files), delete those, rendering again is better than redoing 

the whole work. Consider also cleaning your media cache.

Did you change the folder name that conains the project

files by any way? I always create many saves of my project files and not 

only 1, so if one project gets corrupt, I can still open the other one, and that 

won't take much space. Don't just rely on auto-saves.. It is always best to

create backups when not using Premiere Pro, and better use local drives

when editing inside premiere pro.. keep external drives for backup only...