Can't open workspace

I had to reset my PC, but I kept a copy of my workspace. I reinstalled the exact MCreator version I had, even the plugins that I used.

However, when I try to open it. It says something like missing API geckolib or something like that. So I can't actually recover my workspace. Now I'm confused, because I have the geckolib plugin installed. I even deleted it and reinstalled it just to be sure I added the correct version. I did.

What do I do? I think MCreator is being stupid.