Troubles with Procedural Foliage Spawner

[FONT=“Helvetica Neue”]Hi everyone. I got some troubles with Procedural Foliage Spawner(PFS) in UE4.18. After creating a copy of a project from 4.16.3 to 4.18 when I create a PFS and try to Resimulate it’s give me an error “Unable to spawn instances. Ensure a large enough surface exists within the volume”. But when I create a new one it’s works fine. And the same project on 4.16 have same problem with PFS. But it’s works fine on BSP’s and Static Meshes. Problems only on Landscapes Anyone knows how to fix this? Thanks in advance