When I try build lightmass I see errors:
The team is aware of this bug in the preview build of the tools. We’ll have a fix out very soon (today or Friday).
This should be fixed now. Please re-download the preview back on store…com and you should be good to go.
Just downloaded the free UE4 samples from and still get the same problem that was apparently fixed 2 years ago. Running 4.11.2 and downloaded the package today. How come it still gives errors when building?