Game won't build due to Index out of range

Dear Community, I have been trying to build my game for a couple of times now and I keep getting the same error message. I looked around the forums and there is not really a lot of usable info in this matter or how to solve this. Except for suggestions of decreasing the amount of foliage, but I still get the same error while I have decreased the amount of foliage drastically. Anyone able to help me out with this?link text