An error is reported when the code is run

code：
```python
import cadquery as cq
from lq.topologies.schwartz import schwartz_p_heterogeneous_lattice
cq.Workplane.schwartz_p_heterogeneous_lattice = schwartz_p_heterogeneous_lattice

# BEGIN USER INPUT
unit_cell_size = 4
Nx = 10
Ny = 10
Nz = 10
min_thickness = 0.1
max_thickness = 7
# END USER INPUT

schwartz = schwartz_p_heterogeneous_lattice(unit_cell_size, min_thickness, max_thickness,
Nx, Ny, Nz
)

Error：
ValueError: STEP File could not be loaded
```