No module named 'nr3d_lib.bindings'

[hymreire]

python permuto_MyTest.py
Traceback (most recent call last):
File "/data/mhyy/nr3d_lib/permuto_MyTest.py", line 3, in
from nr3d_lib.models.grid_encodings.permuto.permuto import PermutoEncImpl, level_param_index_shape, get_permuto_cfg
File "/data/mhyy/nr3d_lib/nr3d_lib/models/grid_encodings/permuto/init.py", line 1, in
from .permuto import *
File "/data/mhyy/nr3d_lib/nr3d_lib/models/grid_encodings/permuto/permuto.py", line 47, in
import nr3d_lib.bindings._permuto as _backend
ModuleNotFoundError: No module named 'nr3d_lib.bindings'

Can you tell me how to solve it?