Cannot generate particles using .stl file

[kongweizhen]

I created a sphere using SolidWorks and exported it as an .stl file.
The diameter of the sphere is 1000 mm.
When importing this file into DesignSPHysics, I set the scale factor to 0.001.
The particle diameter (dp) is 0.01 m.
As shown in the figure, the gencase is currently running but is unable to complete.