Hey -
Let me know if you’re project compiles if you replace what you have in your screenshot with the following:
#include "FPSProject.h"
#include "FPSGameMode.h"
#include "Engine.h"
void AFPSGameMode::StartPlay()
{
Super::StartPlay();
StartMatch();
if(GEngine)
{
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Yellow, TEXT("HELLO WORLD"));
}
}