Hey
It looks like you’ve added in those lines of code, as it’s not added into the DefaultEngine.ini. Were you looking over Physical Materials at one point? I would suggest removing those lines of code from your DefaultEngine.ini to see if you’re able to open your project or not.
If you want to keep that information in your DefaultEngine.ini file, you’re going to need to finish it, do you see where it jumps from SurfaceType4=Concrete all the way to SurfaceType30=CollapsedStar? The …'s aren’t able to be read properly, you add in the amount of SurfaceTypes needed for your project.
Here is the [Physical Material Documentation][1].
Looking forward to hearing back from you!
Physical Materials User Guide for Unreal Engine | Unreal Engine 5.1 Documentation