the project could not be loaded, it may be damaged or contain outdated elements

[동규5E19]

Hello, my name is Donggyu and I live in Korea. I'd like to ask the community because there was a big error while working on the Premier Pro.
I think the file was damaged because I turned on the Premier Pro project while deleting the in-design file.
So the phrase "the project could not be loaded, it may be damaged or contain outdated elements" came up.
When you try to open an autosave file, the same phrase appears. Could you tell me if there is a way to solve the problem?

[Joost van der Hoeven]

Please add some more info, like system specs. OS version, Pr version. 

[동규5E19]

Thank you for replying! I use Window 10 and pr version. 2020 14.0