Landscape Custo Brush Static mesh actor has NULL StaticMesh property

Hello everybody!
I encountered the following problem, I created the autolandscape blueprint and after some time I got this error after the day build all landscape (specifically because when entering the project I’m missing a small part of the texture) if I enter the autolandscape function and for example I move one of the textures a little, then re-salez it recovers…but the error reappears when entering the project again.
From what I have noticed, the problem is only with one of the textures (the one from grave in soil from megascans).

Does anyone have a solution to this problem?

Thanks in advance!
Arnold Popescu

Also having this problem after following a blueprint brush tutorial for landscaping. Why is it looking for a static mesh?

From what I remember, something had to be rebuilt