Swarm failed to kickoff

lots of people r saying
rebuilding lightmass will fix this
but please anyone explain how to do that…
thanks

Hey PratC,

I assume because you are seeing this you are running Source. If you are not, please update the post and I will try to figure out whats going on.

Close your project.

In Visual Studio, under “Programs”, find “UnrealLightmass”, right-click it and choose “Rebuild”. When this is done, re-launch your project and try to build lighting again.

its github version
worked
thanks