I just downloaded Unreal Engine 4 and was going to through very first tutorial on creating a new class in the Actor category. However, I got this error. Help is much appreciated.
You should have some more details about why the build failed in the Output Log (Window → Developer Tools → Output Log), or your log file if you’ve since closed the editor (YourProject/Saved/Logs).
Could you post that here (or just attach your log), as that will help us know why your build is failing.