Why is "getSectionFromStaticMesh" not returning any vertices?

Hey guys, I am using a ProceduralMeshComponent to create tiny landscapes which will be loaded as chunks in minecraft. I want to change the location of the vertices to create mountains and more. But the Function getSectionFromStaticMesh isn´t returning any vertices, the length of the returned Array is 0. But it works fine with a spheremesh i have. The problem only occures with the plane i made(and the plane has 246 vertices).

227128-screenshot-53.png

227129-screenshot-54.png

Okay for everyone who stumbles about this question. The solution is to enable CPU Access for the static mesh