UE4 Not Responding when trying to place trees

Hello!
I need help!!

When I try to place a Static Mesh (HillTree 02) in a Landscape Grass Type the Engine is “Not Responding”
I tried to put first the trees and then the grass but same result.

I need an answer cuz I can’t place any type of Trees cuz the game freez.

i have the same problem rn, did you solve it?