Same here with 4.27.2. Annoying. Did rebuilt the engine many times now for now reason. The project doesn’t open anyway. When I try, it says:
ERROR: Building would modify the following engine files:
My start project is set as my project and not UE4 engine. I also did manual builds of the project, where I clean folders manually.
Ok, I got it solved by rebuilding once again, right after it gives the error of ERROR: Building would modify the following engine files:". I just opened visual studio and pressed built. Did not delete the folders this time.