Try validating your engine install. PaperTileSet has been changed (it has an enter between include “IntMargin.h” and generated in the source files). Maybe you accidentally had it open and modified it with a keystroke causing a cascade of errors?
I try to keep all engine files locked so that vs cannot change them if I’m maybe slightly tired and type where I’m not supposed to.
Here is what I have in 4.27
PaperTileSet.h (9.2 KB)
Also close all engine files when compiling otherwise the compiler may throw errors.