Topology optimization problem for gravity( Karamba3d, BESO)

I want to perform the topology optimization of the xy-plane for gravity load using the BESO shell function of caramba, but the result is not coming out. I have attached the Grasshopper file. Please advise.

Gravity (37.8 KB)

Hi, the Isolines seems to not showing the thicknesses properly in 1.3.3 Karamba3D. However this has been resolved in the WIP version which you can download from Release Karamba3D 1.3.3_210426 · karamba3d/K3D_NightlyBuilds · GitHub