Hey, this might have come a bit late. The thing that helped me was resetting the “inclusion landscape layer” and getting rid of the array element. My issue was caused by a foliage asset pack trying to only spawn on a landscape layer that wasn’t actually on my landscape. The error message didnt help with trying to figure this out either. The mawi redwood foliage assets wouldn’t spawn onto my brushify landscape until i fixed that. Furthermore this youtube link will show you the exact setting that i changed.
23:00 is the timestamp.