I am following this guys code, Tristem, on Udemy(His is the black screen, mine is the dark gray screen). He should know what he is doing. Somehow his code is compiling, but mine is not. I have tried imitating him literally, you can see my code is a little bit different, but either way it does not compile. You can see the FVector2D thing is not a problem for him.
I cannot create a new class in this project until I can successfully compile my code.