Unreal crash while importing built static light

Hi everyone,

Everytime I try building the lights only in Preview mode, after compliting the baking, when importing built static light it crashes with a fatal error. I reduced the triangles and the lightmap resolution of my grass as that was the main issue but still keeps crashing.

Any idea of how to fix this?

thank you

By the way, I tried without the grass and it is still crashing :(.

So frustrating.