Lighting not building

Hello,
I’ve big problem. I downloaded the last UE4 on my MacBook Air and when I start building it show 0% completed, but this state is there forever, but there is only the template scene. Nothing bigger. Is it possible there is no Swarm agent?

Thanks Thomas

-what do you have in your scene?
-add a lightmass importance volume
-when you start the built, check in the systray if you can see a small swarm icon (little yellow thing) - double click on it - check something is moving in the window :slight_smile: